Mean,
Long time, no read! Glad to see you got those twin 15s settled into your system.
Dan is right. If you set the sats to 'large', you'll only give those subs a workout with LFE heavy DVDs.
Interesting point here...Outlaw maintains that there is a global 120 Hz. filter on the LFE signal, independent of the sat's speaker setting/BM. I say that's hooey. You can test the theory by raising your crossover setting to 120 Hz in the 950 and notice if there is a difference (there will be, I guarantee).
I think the 40 Hz setting, though it doesn't effect the sats because they're set to 'large', is still limiting the LFE output to your sub to 40 hz.
You should really set your sats to 'small' and try a crossover of 60 Hz (which means your sats should be able to go to 30ish) and see if that doesn't work better.
Give yourself some time to acclimate to the difference before you judge either way.
The number one reason to set the sats to 'small' is that of placement of LF speakers. With sats, you have little if any placement options for what is, in effect, 4 subwoofers, when they are 'large'.
Those Twins/Samson can handle the LF in you setup, no sweat...so let them.
Let us know.
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"Time wounds all heels." John Lennon