Check - Look in the AH2 Cache folder - Every skin should be listed, but probably isn't, in fact very few may be listed. Many may still be in old format.
1) Check skins folder - delete any that arent in the actype_skin# format, these are old ones.
eg old naming would be spit163
new name spit16_3
Applies to ALL aircraft
So any that aren't in the actype_skin# format can be deleted.
If you are unsure you can cross check with the skins download page, bear in mind these are still in the old name format.
2) Delete cache
3) Start game cache rebuilds, but NOT completely
4) Go into game
5) Go thru EVERY plane, EVERY skin in the hanger, you will notuce they load slowly as they are comnig off disk
6) Exit game
7) Go back into game
8) Ctrl + I - Tex= should be around 808.8Mb using 1024 skins. If not you have missed some.
Only assume the skins name change wasn't accounted for in the cache build.