STIPPLE THE GRIP.
you can practice this on one of the back straps you don't use, and once you find an angle or a dot size you want, go for it.
I did mine with a soldering iron and a round tip no pattern just kept going around and filling in spaces.
I think it looks good.
I have very clammy sweaty hands anytime of the year that's why I did it.
I wanted a permanent fix. If when you're done and you find it too aggressive just put some 800 grit sandpaper to it a little at a time till it feels right. If it starts wearing down, and not as aggressive as you would like, do it again. you can make yours how you like it. There are actually stippling tips you can put on your soldering iron and make it whatever pattern you like. And if you don't like that pattern you can make it something else.
Here's a pic

I've done the same thing to my po7 po9 and my new Hogue Rubber Grip on my S&W 4006 TSW CHP.
OH, and if you have a soldering iron it's not going to cost you a penny. Just your time. If you don't have a soldering iron you can get one at Ace Hardware. Weller $16 I use the round tip that came with the soldering iron.