I too wish that Jack was still doing this type of work. I have a special piece that he built for me from a Model 29. The picture below shows it along with its unaltered sibling. In addition to the porting, it received an action job (duh), bobbed hammer, DAO conversion, and polished trigger (it started life as a serrated target model). Later, I had a MagnaTrigger installed and sent it to AP&W for matte hard chrome. It also wears meprolights and is my nightstand gun.
As to the recoil question, it really only helps with PERCEIVED recoil, mainly due to the significant reduction in muzzle flip. It practically recoils DOWN, but the gun still slams back pretty hard. I haven't tried to measure the velocity loss, but someday....
Muzzle flash is mostly a factor of the ammo you choose. I settled on Silvertips due to the very small fireball they generate. YMFMV
