When i check twice, my hand is pretty weak. So, when i bet OTR, my range becomes very bluff heavy (i probably only have some 8x for value here). Also, i expect villain to bluf big portion of his range OTT, because i checked twice. So, when we get to the river he usually has some sort of showdown value hand (Ax or small pocket pair) and he probably doesn't fold this vs bet OTR. I don't like to give up with non showdown value hands, but i think i should just XF OTR.