Thought it was easier to play like that on slow courts, but maybe he just doesn't have the patience for back to back long rallies. Wind doesn't help his game either.
Nope, slow courts mean he'll get drawn into more long rallies, which will expose his BH weaknesses. And yes, wind is a factor too.
Tsonga is at his best when first strike tennis is rewarded, and indoors is the best chance for that these days, even if they're not particularly fast.