I guess with the filter that high, the fronts aren't getting a full range.
Correct, they were only getting frequencies down to around that crossover and a little lower as it is a roll off not brickwall.
If I do this though, is there any way to limit the amount of LFE sent to it? [\quote]The high pass filter would work but by limiting the lows you won't be able to smooth out the response throughout the room, just run the second sub like the first.
You can download some test tones from Realtraps.com and burn them to CD to check your in room response on the sub.
