Learn to use multiple palates and macros for WS gear swaps and swap out another 7 pieces of gear. That will probably be easier and cheaper than trying to figure out how to upgrade the 5 pieces you currently swap for weapon skills, not to mention the added benefit of practicing something that will cross over to all of your jobs.
More than 6 pieces of gear swaps is easy on 360, don't use your laziness as a crutch.
As for gear specifically, I'd start with replacing ammo, bushi, keen for sure. There were better options when I quit at 90 cap, I'm sure there are other better options now @99. Next, neck, waist and Rajas unless you need some or all to keep your x-hit. Again, it's been so long since I quit that I have no idea. But I'm pretty sure there's a SAM gear thread on here with an explicit answer to your question, backed up with maths.