Hello,
some of your points indicate there is something wrong in the setup or mechanics.
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1. Control pulses for the rotor level do not fill directly. Smooth and controlled hovering is therefore unusually difficult.
It should be significantly more stable with default settings than VBar. It seems you decreased Sticks Deadband to 2. This will cause all sort of troubles. I recommend to set it at least to 10 with JETI radio.
VBar is using EXPO function by default - for swashplate around 30% to be comparable to Spirit. For Tail it is around 40%.
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2. A smooth exit from turns and loops is difficult, as the model behaves somewhat stiffly
in this flight phase and follows the control movements unwillingly.
I recommend to set Flight Style to 4 - 6. Unfortunately I do not understand what do you mean by stiffly.
Make sure that all push rod linkages are moving completely with no friction.
Decreasing Cyclic Gain to 40 - 50% can help too.
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3. When flying from one end of the airfield to the other at the same altitude, the helicopter tends to undercut.
The higher the speed, the stronger.
What do you mean by undercut?
It seems your Cyclic Ring value is very low. For this reason model has no travel to compensate at elevator axis.
Increase at least to achieve +/- 10°. Especially if using so big Pitch range you have to set bigger cyclic range, otherwise many other problems will happen. This could introduce your problem 2).
Setting Elevator Filter to 2 - 3 is recommended.