I'm not trying to agrivate anybody but there is an old saying that goes something like this, " If it isn't broke, don't fix it".

If you want a 3-D plane buy one, they don't call it a SLOW STICK for nothing, it's SLOW on purpose, it was designed to be SLOW, enjoy it for what it is and get yourself another plane that is designed to go fast for those days that SLOW just won't cut it, believe me, you will double your fun and you won't end up with an abortion that won't fly well anytime.

My suggestion is go to Mountain Models and get yourself a Dandy or a Dandy Sport, you'll be grinning all the time.
EF