>It's a small frustration, IMHO makes the class/race combo
>almost unplayable - the giant rangers can't camo

There isn't even a size check in camouflage, so you're doing something else wrong there.

>and can't
>creep anywhere, even in their home terrain. The failure rate
>is above 50% with both camo and creep perfected, even in the
>home terrain it's very bad.

I added some debugging to verify, but a quick look at the code, your numbers are way off. Rough estimate is that size makes a 10%-20% difference overall.