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That sounds fine as it is. They can hit 104 and are safe at 90. Cooler is better but you ain't in dangerous territory by any means.
I'm sure if you really pegged it, you could go up to 80ish under load but you could always put a bigger cooler on. Are you using the stock cooler? What case fans do you have? Bigger is better with fans, as they can spin slower, quieter and push more air.
Sounds like you're mostly (entirely) restricted by the space you have for heat sinks.
What kind of temps are you getting idle and load?