On this topic, pretty sure the only 2 people to improve/modify their grip on kickers are myself and Paul.Now I'm not even shooting the Centre and I'm pretty confident Paul could outshoot the majority of us if he turned round and shot backwards.
So for me your point re.mods is a mute one and as John suspected the plus 16 is to much.
Paul was shooting high 170's+ with the standard grip.You openly admit to having your pistols internals polished re lubed and the like but add a bit of body filler to the grip and your thinking they should be classed differently?