[Backlash Scott]

I would agree with backing a 50 class reel with 130 # spectra.I spliced in about a hundred yards of 200# spectra, like McGolfer.It gives you complete flexibility on what size topshots you want to use.I don't agree with the advice that the Avet LX isn't suitable for tuna.The two speed JX & LX are fine for tuna up to 100#s.Both reels are highly recommended by the captains of the American Angler out of San Diego.However, if you're fishing in a location where the tuna are likely to exceed 100#s, you definitely would want to step up from the JX or LX size reels.
Backlash Scott