1997 Acura Integra overheating

My acura integra 1997 continues to overheat. I changed the radiator,radiator cap,hoses,sensors both,t-stat and the water pump is opearational. The cooling fans operate but when you drive the cooling fans will not operate all of the time. The pressure inside the radiator hoses seem to be very hard when the car is running - i had the top radiator hose split. The overfill tank fills up when I run the car hard and air bubbles are present in the overfill tank during both hard and normal running conditions, i was told that is not good news. I removed the t-sat and it seems to not be overheating but bubbles in the overflow tank are still present. I dont know what else to do or change. I was told it could be a cracked head or leak internally and its best to rid of the car before it gets worse. I'm out of ideals. I love my car but the overheating problems have become a problem. Please help me.......
I have the gs model.