just get a light rear wheel i've found that helps sooo much more than a frame thats 200 grams lighter or forks 200 grams lighter etc im running 22-18 gearing now (harder than 18-15) and it feels lovely and i think its because i have a really light back wheel...
just ride it round normally for a while and try not to do much trialsy stuff on it, dont put it under too much strain cleaning out would help too, i havent used a tensile before so im just guessing by my knowledge of hopes/kings