[bluefeet]

Taking the donk lead (30 into 150) after simply check-calling the flop is NOT indicative of a made hand. A made hand is generally c-r'ing the flop, or with the call - probably letting you take another stab on the turn, or taking a more substantial lead himself (given the draw friendly board).

His peculiar betting looks much more like a donk draw or a "piece". Given a fairly small pot on his turn lead, I would make it t125'ish to go (folding to a push). Protecting your probable best pair, I think you get the same price to showdown...and just as often pick up the pot from the FD/"piece" holder.