having some positive airflow is a good thing, it stops dust intrusion to some extent.
i dont believe that level of positive would have a negative effect either, however, if the 92cfm on the H80 is just push or pull, put into push/pull and you should be all good
I would change the H80 as an intake rather than exhaust. In reality the air flow is not 92cfm it has to go thru a radiator. The reason I like it as a intake is the radiator get cooler air and better efficiency. The outside air should be cooler than the air in the case. Since you have 3x120 the hot air from the radiator will be pulled out right away.
I think that it might compensate through the radiator, the H60 which has a single 120mm fan is rated at 72cfm, so with the other fan helping it should boost it some, so yeah roughly 92cfm. I also forgot about the PSU, I've got a raidmax 730ss and per their tech support the exhaust is rated at 47cfm. So all in all we're up to 386cfm in and 346cfm out so all in all it's actually pretty close with that little difference in the airflow I'm not gonna sweat it. Thanks for the help