new sids top out?

hi i have just fitted a pair of 08 sid teams the 2008 with 80mm travel and 28 mm legs they replaced a pair of 08 rebas wich seemed long and heavy although very plush. the new forks top out with quite a thump unless i run about 10 psi more in the neg chamber this causes loss of already short travel the rebas never topped out in my experiance. do sids normally top out? anybody got experiance or ideas i have tried +95-95 +95-90 the only way i seem able to stop top out is around +95-105
thanks for looking :?
thanks for looking :?
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