Yeah...or am I going to need two 1000.1's?
Any other amps you guys would recommend to push these 2 JL's? These subs have a weird ohm load, so I'm hesitant to run anything else.
It will be fine. The difference will be less than 2 dB which isn't in the realm of "clearly audible." The not clearly audible difference will require fairly extensive electrical upgrades, more complex wiring and tuning and of course the cost of the second amp.
You won't be "underpowering" them. You'll still get the vast majority of what they have to give.