Hey Chris ,
Well I had a quick look.It’s nothing too exciting , not much headroom by the looks of things.
I really don’t like the meter being there , it only makes things worse.
A separate buffer is always preferable.
Here are some quick instinctive thoughts….(hopefully we’re talking about the same diagram here….) :
R3 could be bigger
Things like C8 C10 C2 C3 don’t really need to be there if it is made well. If the spacing is right , you won’t have oscillation problems.
R5 should be a bit bigger say , 1.5 k or 1.8 k . R4 should equal R5.
I wouldn’t load the circuit with the meter.
P1 should be bigger…..maybe 500k.
R6 could be a bigger….maybe 10k or even 47k.