I have sometimes the same issues.
For twin (and more) engine throttles i found a workaround that works mostly.
I align the knuckles of the blue VR Hand with the two (or more) throttle levers and only grab them with the controler side button, not even with the index finger (Trigger button).
With a little patience you will find a well working position and the levers will move simultaneously.
If this don't work for you, you can also adjust the throttle with the thumbstick on the left VR controller (of course that is not that immersive), in this case all throttle levers are connected. Thumbstick forward increases, backward decreases throttle, if the throttle is full back then thumbstick back operates the wheelbrakes.
With the left Controller thumbstick you also can operate the rudder (taxi and align to runway, if you don't use extra rudderpedals)
I know VTOL VR but the cockpits there are specially made for VR usability.
In a simulation of real existing Planes probably some compromises have to be made, especially in narrow cockpits.
By the way, in the Baron i had my struggles too.
As a suggestion for IPACS: For VR it's maybe better to let move the throttles always together and avoid adjusting them individually. Maybe as an switchable option?!
Kind regards