Most of what you want has already been answered. Let's review...
• First and foremost I have to say, I agree with RecoilGuy. You cannot buy your way to a championship by building the "Uber Cartridge". It takes a lot of practice. Nothing can make up for good, CORRECT practice. If you want to make sure your practice is correct, then I highly suggest you take one of those action pistol classes from a Master. You can learn some tips by watching several YouTube vids, but those tips are usually only "scratching the surface". Vids are not going to correct your stance, your holster height, your belt tightness, or your vision issues. There's simply nothing like an in-person class with one-on-one time.
• Early on in this discussion I gave you the "Angus Load", but it seems not to have penetrated. Angus Hobdell is a moderator on this site and multi-time American and European action pistol champion. He once disclosed his load on this site and I gave that to you. He uses a Zero (brand) 124gr JHP over VihtaVuori N320.
Allow me to analyse those components for you...
- Jacketed because nothing else comes close. Jacketed simply fit the barrel more consistently lot-to-lot. Consistency = repeat-ability = accuracy. Hornady HAP is the closest bullet you've mentioned that I recognize. We recognize the Fiocchi name as being a very, very good component, but their bullets aren't available here so we can't comment. Again, you can most easily settle this for yourself in 10 minutes with side-by-side target testing from a sandbag. If the results are the same, then buy the cheaper component.
- Hollow Point (and here I bow to TdC's superior analysis) The instant the bullet leaves the barrel, the MOST critical part is to have a consistently shaped physical base on the bullet. The only way to get a CONSISTENT base is to have a meplat-filled jacketed bullet. That is to say, a jacket which is filled with lead from the nose end. Forget bullet shape (TC, HP, FP) and concentrate of the method of manufacture !
- 124gr because the twist rate of most 9mm barrels is cut for that weight range.
- N320 because it's burning at about 95% of its Max Load, which means it is burning super efficiently. It is also a single-base, so it's running cooler than a double-base powder. That means you'll also have less "throat erosion" in the barrel over time. It's throat erosion that generally (and quietly) robs a barrel of its accuracy. No doubt that there are many other powders available to you. The Nobel Sport Vectan BA series might be a less expensive equivalent powder. Again, you can most easily settle this for yourself in 10 minutes with side-by-side target testing from a sandbag. Test several powders and then use the most cost effective.
• There is continued discussion of OAL, and there should NOT be. "OAL" is what amateurs talk about. OAL contains, but masks, 2 critical features which first rate ammo MUST have. 1) The bullet must NOT engage the rifling. The simple test for this is to spin the cartridge in the chamber. 2) The bullet should deeply engage the cartridge case somewhere between 0.200" (5.0mm) and 0.250" (6.3mm). You should spend time reading our Stickies.
• You have mentioned "crimp" several times. It should NOT be in this discussion. Crimp is a function of your barrel. Crimp does NOT hold the bullet; however incorrect taper crimp can have an adverse effect upon the bullet and cartridge chambering. Again, you should spend time reading our Stickies.
• Finally, there is no replacement for 100% inspection of all the ammo you plan to compete with. As in any competition, the competitor is faced with things both in and out of his/her control. So the wise competitor minimizes the total effect as much as possible by absolutely controlling every detail of those things within his/her control. This is intuitively obvious, but often overlooked.
Again, all your questions have been answered to the best of our ability. A good bit of what you're asking can really only be answered by you, using your gun on a target range with your pistol resting on a sandbag. In the USA we have a saying "the proof is in the pudding", meaning it doesn't matter how much or little you spend on ingredients, what matters most is how the finished pudding tastes, or in your case where the bullets hit on the target.
In the USA it is quite common for us to derive such answers by spending hours on a range doing side-by-side testing with the gun resting on a sandbag or other very stable surface. (And usually over a chronograph.) For instance two or more bullet brands loaded into otherwise identical cartridges. Many of us have such ranges in our back yards. It's not clear that you have such access, but let me assure you it is irreplaceable in honing your reloading skills and choosing components that will work for you.
All the best.