yeah, seems a bit high. i'm in texas and my wife keeps the house pretty hot (around 78F) this time of year. but my case is at 26C right now with 2 intake and 2 exhaust. nothing fancy and low cfm from vantec stealths.
i would try to lower yer case temp. remove the panel and see if it goes down any. also, u didnt mention which fan for your HS. the sk7 is a good sink but fan will matter a lot. and unfortuantely, the fans that work the best with the sk7 are the high dba ones (delta, tornado, direct flow ones, etc).
were u careful about a *thin* layer of as3? and are u sure the sk7 is set well?
deadseasquirrel