in regards to vr sickness in SRV, i can defiantly say that when using my Oculus.. i could vomit almost immediately if driving forward and then looking left or right! but in the 4K i can drive anywhere and not feel sick no matter what i was doing? go figure!!
I also use VA and have learnt that training your PC to recognize your accent is one thing, but VA may not be activating at the start of your phrase - if you are using 'request docking' as a phrase it may only be coming on during the last part of the words 'docking' and so VA does not see it as a legitimate phrase, so increasing your mic sensitivity helps also, if the VA does not respond to a known phrase, have a look in the VA main window and see what word it thinks you said.. then add that word into the command.
i.e. you say 'speed 100' and it sees 'seed 100'
now add 'seed 100' to the command in VA so it can use speed 100 and seed 100 as an alternative.