Also feel that we should go a few ounces lighter than the pros, as they are much stronger and fitter. If Ben Stokes is using 2lb 9oz, I should be using 2lb 5!!
Can see why you'd argue that but a couple factors come into it IMO.
Firstly, we're not facing anything like the pace they are. There's a Hales clip from a while back where he said he went down from absolute monster bats to 2'10 ish because he started facing real pace and he had to get into position to play the short ball. Vast majority of clubbies will never face anyone genuinely fast.
Secondly, we're not playing with the quality of cricket balls or on the quality of outfields they are. There are some lovely club grounds but at most I've played on you need a bit of meat to get the ball away, you can't just elegantly time it all along the ground and make many runs. Equally, Stokes can probably hit a 6 with a 2'6 bat due to the sheer power he has. I need a bit of assistance to clear the infield and the best way I've found to do that is a bat with a bit of heft to it.