I use pro grip shooting revolvers if I need to but am a skateboard tape fan for 1911/2011 pistols.
2011’s I use one piece and save the template.
1911’s I get a set of cheap panels and sand the checkering off, tape then trim. If the front strap is smooth, I tuck another piece under the front of both sides.
As far as actually holding one that’s a little more difficult for me, without being with you and a firearm. Basically you want the most contact you can have between you and the firearm, least amount of fingers/palm not touching surface area on pistol. Looks like #4 but slight rotation of support hand can make all of the difference. You can go CW/CCW a bit and feel, once you know what your looking for. A couple weeks and it’s natural as you bring the pistol up. My right hand is fairly loose, with my left applying more grip to my right fingers, than the muscles in the right hand, this keeps the trigger finger “loose”.
I agree with folks that say the grip is more important as with a good one things stay put pretty well without any tape or chemical grip enhancements.
However, the better locked together the firearm and I are, the less pressure I have to exert and the faster I shoot, transition, reload,…