I too am getting big hits with my E7 at around 100ft while flying, on 40mhz PPM rather than QPCM. All 3 of my superslim7 rxs on the 40mhz band are affected, all in different airframes (foam slope gliders!!). I've tried new tx and rx xtls, changing channels from 485 to 451 to 465, with no improvement, I even change flying sites to see if the problem is local......nope. A fellow pilot switched to Futaba after he felt it was his E7 that killed his Sig extra due to limited or no response at moderate range of 200ft, all other causes were checked out such as battery pack, switch harness, push rods, other txs at the site, etc.
I have several indoor helis which so far seem ok with their SS7 rxs and the E7 (max flying range thou is only 30-50ft away), however my confidence in the radio is gone.

I'll be buying Futaba from now on.