I was in this position several years ago and found Texaspoff on this forum. I sent him my Gen 3 G19 since I have larger hands (2XL gloves needed) and the finger grooves were in the way and the grip heel felt awkward. I asked to have the finger grooves removed, fill and sand the heel and undercut the trigger guard.

When I received my pistol back it felt like a new gun (mine looks just like the G21 image above). It points great, the texture improves my grip and I am very impressed with the work. The texture has held up great and I would not hesitate to have the work done again.

In saying this, I have no experience with grip modifications by any other company.