Good job, I ditched the London as I gradually found it boring and my results were...inconsistent. I do play the Vienna as white providing the opponent responds e5, you just need a plan if they don't, lots of 1000s accept the Vienna gambit as they don't realise the idea behind it and even if they don't you're solid if you play right.
I'm on a bit of a hot streak right now I hope it continues, been working very hard to improve.
Good luck on further progress
Flailed around between 5 and 700, played a lot of fried liver attack from 700 - 800, kings gambit from 800 - 900 and pretty much exclusively London system as white from 900 - 1000.
Thinking of adding Vienna to the mix. But seems much more complex a game than London which I have played almost all the main lines for by now.