In my opinon you would be overdriving your antenna by using a 91XG with a CM7777 when you have a station 10 miles away. However, I would have thought the 43XG would have done that.
On the chance that you swamp your tuner with too much signal, you can use a attentuators to reduce the signal. I recommend an adjustable attentuator, you can lower the signal just below the point over overdrive.
There is this generic one:
20dB Variable Attenuator for VHF UHF HD Off-Air Reception | 1296F [] | antennuator anttenuator attentuator attenuators multipath
And the Winegard model:
Winegard TA8700 Variable Attenuator 0-18 dB for Off-Air Antenna (TA-8700) | TA-8700 [Winegard] | TA-8700 attenuator TRAPS Pre-amp preamp
-Mike