Temp and humidity do have an effect. How much? Not much with most engines. A couple of clicks of needle worst case unless the engine is a dog.

Atmospheric pressure has as much effect. don't just check two, check all three. Or just adjust the needle first thing.

You've mentioned an important thing and not mentioned another thing. Your engine sounds like a new one with 11 or so flights. That's about the time that low-speed needle tuning comes into play with a bunch of new engines. No mention of anyone thinking about that. And experts who suggest a new carb should have tried to set the lowspeed properly before resorting to that major cure. And truth is, you ought to be able to point to a major problem that is obvious with the carb and that isn't fixable before resorting to a new carb. I've seen a number of Evo's that ran like crap. And a couple of the ones that got their lowneedle tuned didn't run like crap afterward.

A significant number of new engines benefit from lowneedle tuning.