I'd say go for too wide over too narrow.

say 40/0 over 100 hands limps UTG
I'd say it's ok to say XXs, all connectors, all 1 or 2 gappers, Ax, Kxs, Q8o+, Q7s+, all pairs

so what if he doesn't play 72s because someone taught him that 72 = bad

say we raise and he calls
if he doesn't always call after a raise, maybe we can narrow it down to suited 3 gappers, suited cards where one is a jack or better, connectors,1/2 gappers, Ax, Kxs, all pairs
doesn't matter if he plays a slightly different range

but if he cold min 4b you he has QQ+, AK weighed heavily toward AA