Personally, I would just go for some heavier springs first, cheaper alternate to buying a whole new pair of stilts (especially 7s, not thats theres anything wrong with them
)
Im 9.4 Stone and on M80s at the moment, chances are once Ive put on more weight (I seem to be going up each week) Ill be getting a heavier set most likely 90s or 100s (or DKs Fusions
)
Remember, Muscule weights more than fat and youll be toning alot of muscules up on PJs