Coolant bubbling?

I have been fighting a problem with my truck for weeks. I was driving and noticed it starting to get slightly over normal temperature instantly pulled over shut it off and it was bubbling the coolant out bad. Did a compression test and found that number 5 cylinder was at 60PSI, and all others were around 150, swapped heads around and low compression problems moved to number 4 on the other side conferring the problem was in the head. Take heads to a machine shop, they confirm, yup, crack in the head and show me the crack. I purchased a rebuilt set of heads from them, purchased all new gaskets, decide to replace water pump just cause being that it was still under warranty, tested thermostat by dropping in hot water on my stove, and blow through radiator and hoses to make sure nothing is clogged. I put the truck back together after cleaning very well now getting 148-152PSI on all 8 cylinders but still getting bubbles in the overflow tank and it’s over heating again just taking much longer to do so. Noticed though even once the truck rose close to 235 degrees upper and lower radiator hoses were cool to the touch and could stick finger in coolant and it was also cool to the touch. Is it possible that even though the thermostat tested good it’s not opening? If so, why am I still getting bubbles in the coolant, just that much air in the system still? Really lost on what to do next and sick of just tossing money at it. Any help would be really appreciated.