Update:

So I found the Xbox 360 PC controller kit on sale for $35 bucks at best buy while I was buying a bunch of mis-priced battery backups for work (750 VA APC UPS units for $39 which are usually $89-$119) and I used a $10 off coupon I had to get it at $25.

It turns out that I was right. The "Microsoft" controller kits they sell on Amazon are knockoffs. The real Microsoft kit works perfectly with the JP drivers. YAY Me!

So don't go buying the Xbox 360 wireless controller kits off Amazon if you plan to use it for FFXI. Buy them from a legit source.