The Failsafe neutral should be in the middle .. they shouldnt be that hard to set as long as your receiver isnt producing a string of valid but random signals when the transmitter is off.

The voltage rises on my charger as well ....... its fine.

The jerkyness is more than likely interference of some sort ( the source can be difficult to pin down ) and the FS1s will have a limited dampening effect ....rejecting bad signals.