Definitely switch to heavier bbs if you're playing outdoors, the lightest I'd go is .28g. Leave the. 2s for CQB where IMO they're a better choice
Joule creep is definitely a thing, although it affects gas guns (especially nbb) more than AEGs or springers. For AEGs I wouldn't be worried if they're not already close to site limits but for gas guns I'd be wanting to be a little more cautious.
Unfortunately the only way to be 100% sure is to try it