Weird revving issue and bike wont idle

[Fazerider]

It suggests the bike's running a bit lean: like Jules-C, mine only needs choke if the temperature is below 5˚C and even then it can be eased off after a minute. Perhaps the cleaning didn't shift all the muck out of the slow jets… were they blown through and checked or did you just rely on the ultrasound?
If you're sure they are clear then it might be worth adjusting the mixture screws out a bit, mine are just 1.8 turns out, but I recall reading that others on here found as much as 4 turns was needed on theirs.

any way you know of to check the tank?

I've not tried one as I've a Mac which they apparently don't talk to, but USB endoscopes are ridiculously cheap. This one looks as if it should be small enough to make the tight bend needed to get completely into the tank for inspection purposes.