Here's the list you can swapped the spool to get more line capacity for popping:
4000FA w/ 5000FA spool
6000FA w/ 8000FA spool
10000FA w/ 20000FA spool
4000SW w/ 5000SW spool
8000SW w/ 10000SW spool (just get 10000SW reel for popping and you're done, unless you want 8000SW for jigging with more line capacity)
18000SW w/ 20000SW spool
As for jigging get lower gear ratio reel.