I could be wrong, but I think PittRules55 is saying that he received it back after the new pivot and now there is play in the blade.
I have two Grips and both lock up solid.
Is this an old knife or a newer one?
The reason I ask is an older can have more wear around the pivot that could be causing it, but a new one should not have any play at all.
If the knife is relatively new, it sounds like you may be turning the pivot screw too far for adjustment.
Literally; the tinyest movement will make a difference. If you're doing 1/4 or even 1/8th turns, that's way too much.
I'd also recommend making sure the rest of the screws are snug.
If all else fails I think RevDevil is right; BM should make it right for you. I find it surprising that they sent your blade back with play.