1) I assume that by "update" you mean remote control. You are correct that the way to remote control a parameter is by MIDI CC. But, you are incorrect about the ranging. The MIDI values 0-127 control the parameter over its entire range, so MIDI 0 is the minimum and MIDI 127 is the maximum.
2) I'm guessing that you have H9control connected while you are sending your MIDI sysex requests. Sorry – you can't use MIDI and H9Control at the same time.