Car has an annoying and persistent overheating issue?

My car has an annoying and persistent overheating issue. Normal driving conditions in motion it stays just above 195. When sitting at long red lights it tends to go to the next peg. I've changed the thermostat, reservoir cap, coolant temp sensor, fan and fan relay. I think that's all. It all starts to blur together after a time. No visible leaks that I have found, no oil in the coolant or vice versa. Oh and I can't drive it over 65-70. Any speed beyond that and it blows coolant. System has been burped multiple times using a burp funnel and I make sure the coolant is 50/50 mixed. Oh and turning on heat only causes it to overheat faster. I'm at a complete loss. I've worked in parts for 7 years and nothing I can come up with or any tech acquaintances has helped at all.