A big Cobia can spool a 30 class reel if yer not careful, thats why I said the 545 might be better, more line capacity.
My two Cobia rods for the surf are...
1. Lamiglas 1502 12'3"/Daiwa 30shv 6-10oz+bait
2. Breakaway 1508 2p/1p 12'4"/Abu 7500C3CT 8-10oz and up+bait.
I also am gonna try the 11'9" Breakaway/525 Mag on em this year, lil more sport lol
I use all those on Drum and Stripers as well, just switch out some reels here and there.
I run 20# string on the big ones, 17# on the 525. If you run 17# on a 30 or 7500 I believe you would be safe on the capacity category, the 17# Sufix Tri-Plus breaks over 20# so Im pretty sure you could catch a big Cobia on it. I think I just may try it myself.
All three rods are custom built BTW.
Adam