First - welcome to the gang!!
Is my temperature to high for Ale?
Yes - way warm for a Wit
Will leaving it for three weeks in secondary help?
always - 1 month is even better
OK #1 you should try to pitch your yeast colder - I'm doing Hefeweizen and I'm hoping to ferment at 62 - in my opinion anything above 70 is too warm. But that might not be the problem.
Could be the recipe? Kit?? Water?? Light colored brews are tough if you have not played with the water. PH can be too high and you will have hops probs .
Don't trust local LHBS guys unless they are a known brewer and not just a guy with a job.
Check out Green Apple flavor http://www.mrgoodbeer.com/apple.shtml