Okay so I understand you are still experiencing a problem. Here is what I did maybe it helps maybe not.
When connecting via phone or laptop I use and /or get the following devices paired:
-Bkool smart pro 2 shows ERG mode option I touch nothing just ensure it is paired.
-Bkool smart pro 2 shows pwr and cadence option I SELECT CADENCE only
-Garmin Power meter I just make make sure it is paired but Donot touch any settings
-V3 - ensure it is paired and I calibrate it as well. HOWEVER I ALWAYS USE MY EDGE 810 AND FIRST PAIR THE V3S TO THE 810 THEN I PAIR THE V3 DEVICE ON TR App
The above routine is what I do and my power shows up good on both the Edge 810 and the TR diplay.
When I tried to synced the Garmin Power meter and or the BKool Pwr meter I had problems so I keep the devices paired but dont touch any of the settings.
I know it sounds a little crazy but it works so I have just gone with it.
I hope this helps let me know how it goes.
I have only used the V3s on the road once and they worked like a charm.