I recently purchased a R9s, and really like it.  However, it just beats up my trigger finger when firing.  I have also had this problem with a Seecamp 380.
I have fairly large hands.  I have been shooting pistols and revolvers for over 40 years.  I have a lot of experience with hard recoiling guns, but have never had this problem.
I put some grip tape on my R9, thanks to a generous forum member, but have not fired the pistol since.
My question is:  should I just use a "death grip" on the little guns, or is there another technique that I could try?  I always have a firm grip and have not problem controlling the guns, but the pain is getting old.
Any suggestions will be greatly appreciated.