Yamaha DTXpress/DTXplorer/DTXtreme

OK Guys, help me out.
I have a college degree and I'm pretty smart, but this rejection 
setting logic (and its explanation in the manual) has me stymied.
Here's what I'm trying to do:
I have a Pintech cc101 snare. The snare triggers into #1 and the rim 
into #9. For one of my kits I have a snare (#98) for trigger #1 and a 
sidestick (#112, I think).
Naturally, when I go for the sidestick, on trigger #9, I end up with 
crosstalk coming from trigger #2. So, I thought I could go to the 
trigger setup in #2 and set a high rejection value for signals coming 
from trigger #9. 
The LED looks something like this:
Trigger #2 
SPCrej = 9   frm = 9

However, this action cancels out any signal at all from the rim. So, 
I reversed my settings, like so:
Trigger #9
SPCrej = 9  frm = 2

This resulted in the same outcome, in that I could only get a snare 
snare when hitting the pad or the rim.

I didn't have time to mess with this further, but I'm thinking that I 
should now try one of two things:
1) Use the first logic but lower the SPCrej value.
2) Go back to aucustic drums.
Advice?
Stephen (Not as old as Walt, but feeling every bit a much like it)