sorry another shock question

[gerbil]

hi yall im running a x6 squared with ae shocks and have been doing for a few weeks and find it runs really well how ever looking at mine compared to a friends with losi shocks
the rear has no where near the same amount of travel
over the bumps it slaps it arse on the ground
i ve put heavfier oil moved the shock as to get max clearence but still the same not relly major issue but i was wondering if anyone had any advice
is there long shock bottoms that are availible
thanks in advance