Mixing power modes

I know this has been mentioned before, but I'm wondering if there is a consensus, or an "official" answer. Is it OK to mix power modes on the 3 channels?

Some say it's OK to mix 45 and 90, but not 10 watt modes. I'm just wondering of all are safe, or if there are some modes you shouldn't mix. Got a new Strat type that I want to try some 10 watt Tweed mode cranked. Need to know if that's ok with C2 and C3 in 45 or 90 watt modes. And for that matter, if I also want to try 2 or 3 in 10 watt mode.

You can mix any modes, but it may pop going into/coming out of 10w mode.

I figured the manual would say if it was an issue and it doesn't, but I've read more than once now that you should mix 10w with other modes if switching channels. Figured I'd better ask. Thanks!