When the bluefin bit 2 years ago near Santa Barbara Island they wouldnt bite the 30 too well. I did land one about 50lb on 30 first thing in the am but from the morning till noon the bite was a pick. As soon as I switched to 20 it was like a light turned on and got 4 more. By the end of the day they only bit the 20. I got 4 more throughout the day including another 50 lb'r but those tunas were tough to land on 20. Later in the month they stopped biting the 20 and you had to drop down to 12 and 15lb. Actually, 20lb is pretty pretty strong and you can put a lot of pulling pressure with the correct rod. Too stiff a rod and you will pop 20 easily. I like long med fast action rod like a Calstar 900XL or my favorite Rainshadow 1082 in a 9 foot. A long med fast rod will hurt a bit but it will be very forgiving when you start to pull yout @$$ off on the 20. Any small reel is good as the rod matters the most to get the most out of a 20lb rod. Bassman...your rod rating of 12-25 is perfect. I always go with the rod ratings in the middle and in your case, 20 is good to go. Personally with a spectra backing I like 12 yards of flouro or 1/2 of a spool of flouro. You need some stretch and shock absorbtion. The only issue I can see is a short rod bottoming out and when the rod bottoms out thats when you will hear "pop" and the 20lb line will break.