CA will not bond to delrin no matter what technique you try! need to try and plug the holes with a toothpick and then glue with some epoxy. by your explanation it sounds like your not getting much if any differences than before. i wish you would have tried them first the normal way with laptimes and then compare them to upside down. with the standard way you gain agility and jumping is increased pretty dramatically. if your able to run oil that thick then the holes are REALLY too big in my opinion. and that may be why the differences are only mildly better than normal pistons. think about how big your holes woudl need to be on single stage piston to run oil that thick.
not to pick on you but dropping your truck 2.5' doesnt really prove anything since you will never be in that situation on a track or even while moving its impossible to drop straight down, you will always be at some angle and either accelerating or decelerating, which makes a difference. just food for thought.