Sorry how have you gotten passed the VAT limit at 70K or do you not have the 70K limit in the USA Amazon?
Isnt VAT limit a UK / EU thing only where it requests tax information?
A little trick I tried on CA Amazon, it requests tax ID but in Canada you can only have one per life time and you cannot change it so I put a random number in the TAX portal on Amazon and it worked. Not sure if anything will come of it.
They distribute the full " available" balance. Each transaction goes into a queue and then is added to the available balance after 7 or 14 days ( I have to check). Then distributed bi weekly .
It's 14 days.
My last account was locked with $14k in it. Biggest value = 35k monthly. It's truly nightmare for managing.
Withdraw as many times as you can, because only a few complaints can f*ck your account.
Re: What the most you held in your account ? 
