Replying to Getting more bounce out of your tramp?

i have a pretty old trampoline and i don't get very much bounce out of it at all.  when you jump the tarp almost hits the ground below you.   i would like to use  my tramp as a training tool this summer but because its so not bouncy i can't really throw many large tricks.  is there any way to increase the bounce on the tramp?  i heard crossing the springs works but i am skeptic if that would work.   if i have to buy a new tarp and springs so be it.  +K for good answers and please no hate.