For long trips out of Port A, I would start with a 300g-400g spinning rod from 5'4"-5'8" paired with a Shimano 8/10k sized reel (look into adding a 12/16k aftermarket spool to add capacity). If you go quality on the reel (Saragosa or any year Stella) and add the capacity with the spool, you will be well-matched for 99.99% of tuna you'll encounter here on jig/pop gear (40-100lbs).
This combo is light with the smaller reel. Strong with the heavyish rod and 65-80lb spectra capability. And versatile with the ability to jig, lob poppers, and chunk or live-bait with. You can also split it up to make both 300g and 400g combos as you add gear.
You can also mimic this for popping gear (once you decide that the surface take is more addictive than crack!) Same reel setup, except possibly switching to hollow core spectra. I like throwing the 40/60 as often as I can get away with it, and switch to the 60/80 in crowded or larger fish situations.
Here are a few guides that might be helpful to read. Glenn's guide has been read by everyone getting into this type of fishing. Mine is what I've learned from others who helped me get into this kind of fishing, and then adapted to fishing in Texas. Hope it helps.