1. Rigging/fishing AJ is a really different exercise/challenge from rigging/fishing for YFT. Whey you use the same rig for both you make some compromises. For AJ, the job is (a) to get down (1-3# of lead, depending on conditions) to where the good ones lurk; (b) get bit (stout hook; live bait--even 2-3 # ok); (c) lock the AJ down (really heavy drag and line strong enough to take it; meanwhile, you're walking the deck away from the rig) before he wraps you on structure. 2-spd reel makes a huge diff. on larger units. 80# line can do it and the reel you mentioned probably cannot take advantage of anything heavier. Otherwise, I'd prefer 130# line (and, it's cheaper than the 80!) For large AJ you don't need line capacity so much as powerful drag and heavy eqpt. I would not fish the reel for this purpose w/ mono only. For AJ, I don't use a topshot--the 8' or so of my 200-300# Momoi mono leader does well enough. And, altho I'm sure Mr.Bill has fished and caught more than I have, I would not use Momoi Diamond line in any color for any purpose other than trolling (if then).
2. Tuna are another story. Tuna like to run long--100 yd runs not rare--AJ's run short and hunker down. Although it can be done; you'll have some difficulty casting the reel you mentioned far enough to do much with Tuna Hunters or Yummees/Frenzies (flying fish lures). The reel should work reasonably well for drifting baits or jigging. For YFT, you will need line capacity and drag that won't fade or seize with long runs and maybe lots of heat. For tuna, you'll rig much lighter (for stealth) and to facilitate casting, if you're going to do that. I'd use a10-25 yd topshot of 50-60# mono for throwing surface lures or up to 80# mono for drifting bait.
As for loading the reel w/spectra. I don't know its capacity. JB recommends against the practice of using occasional cross wraps to prevent loaded spectra from digging into itself when under load. If you load it correctly, JB's right--but, you must load it under a constant 5-7#'s of strain. This leaves a hard mass of line which is hard to dent with your fingernail. Hard to do w/o loading it first onto one reel then onto the target reel using the drag on the first. Expect trouble on the water if you attempt to hand tension the spectra with one hand while you wind it on with the other hand. You'll eventually get a hard pull that'll bury the spectra in itself on the spool. Bye bye fishie and terminal tackle and maybe more if you don't hold on tight.
When you load the 80# non-hollow spectra onto your reel, allow room to connect 100 yds of hollow spectra and pull a loop into the working end so you do not cast knots. BTW, I'd avoid any spectra which uses any non-spectra fiber or which has any color or waxy stuff in it. This is all trouble.
There, that should stir things up a little.