After 2 and recovering from the 3ed back surgery .I can tell you.Most on this form are not going to read or understand your quest.(9mm pcc has a bone jarring recoil impulse. That can be reduced significantly. First weight is your friend (make the gun heave).This is a double edged sword so to speak.I have tried Taccom , and MBX Systems. Ended up with a BLITZKRIEG system. this onehttps://www.blitzkriegcomponents.com/ProductDetails.asp?ProductCode=PCC-5015HDCP and a POF ar10 buffer tube https://www.blitzkriegcomponents.com/ProductDetails.asp?ProductCode=POF-BTAT-10 Next don't short stroke the system it makes the recoil sharper. Ammo has a large effect
on the recoil impulse. Ill suggest ether A 135 or 147 gr bullet using Sport pistol powder loaded in the 130 to 140 power factor range. Now after you have a load and buffer system in place you can experiment with short stroking but be aware it will be a" sharper " impulse. you will just have to experiment with that your self FYI the MBX system was my next choice on recoil.