Some additional information - you all may recall my comments about black grip screws.
Well today I got to the range with the pup for the first time since installing the black screws. While I didn't shoot quite as many rounds as I did the first range session, I checked the grip screws just now. While the first range session managed to loosen up 3 out of 4 screws, after the second range session, all 4 screws are tight. While I know I could remove them (because I removed two night before last and while they were tight I could easily break them free with no visible damage to the hex sockets) I see no need to - the lube is still fresh and the area is clean so there's no need to.
I consider it an improvement that the screws stayed tight - as they should.
I am also working on what might be a better hex key for pup screws; I just received an order this morning and want to figure out a way to quantify and verify the manufacturer's claims for the tool - they claim that it can supply 20% more torque without rounding out the screw socket than standard hex key designs. If true (and it sounds a little bit hard for me to believe) then it could represent not only a cheap but a better solution - regardless of whether stainless or black grip screws are used.