Looking for suggestions on new leafs

Thanks guys for all the info. I contacted espo this afternoon and looks like they may be the way to go. I can get a 5 leaf set for $185 and a 6 leaf set for $225. Very reasonable. I contacted a local place called Spec Track and they wanted $275.00 to disassemble the pack and re arc the main spring. One day turnaround. I'm thinking that the 5 leaf set from espo is the way to go, but I'm also thinking the 6 leaf set may be the ticket as well. The car has an additional 15 gallon fuel tank that feeds the original 24 gallon tank, and with it completely full of fuel, the rear sags quite a bit. I think the 6 leaf set would hold the weight better. Thoughts?