Update: 1/15/2020
Pics of one of the replacement followers vs two of the problem ones. The replacement is on the left in each pic. I didn't include side pics of the cutout area on the vertical piece as that cut seems the same on all of the followers.
Attachment 16462 Attachment 16463
I don't know if the new one(s) received will work. I also don't know that the ones I had issues with (the right one in each pic) was from user error, e.g. installation issues, although I followed the instructions and double checked with MagGuts installation video for Kahr AND followed the installation conversation in this thread. The two ones I had issues with, however, do seem to have slight differences than the new one in the pic. I'm wondering if the required tolerances related to the bends, cuts, the longer spring on the 7 to 8 conversions, or even softness of the metal might play a factor, but the differences don't seem to be uniformed on the two that I had issues with.
I'll update in a few days after I test the replacements... although I might try hand racking some snap caps tomorrow (loaded a few snap caps into two magazines to help the spring set). I'll also retest the one 6 to 7 round conversion to verify that it is functioning properly for me, as it did during the first range test. I don't know what range ammo will be available from my local shop as it tends to change with fluctuating prices to the shop, but I usually carry Rem HTP 115gr +P, which will make it into both tests.