Now that I have 900 miles on my vado 3 I find I could use another gear. I shoulda got the 6 but didnt so how can I upgrade the drive train for a few more mph. Advice will be appreciated.
If you need to go faster get larger chainring.
For lower climbing gear, Sunrace do a 10spd 11-46t cassette compared to 3.0 11-42t. You may want to research if derailluer can handle large gear.