A perhaps easier and safer approach might be to use a Cap 1 convenience check. Cash it, put in a savings account, then repay it.
With my Cap 1, I did a BT to max out the card to $300. Got the statement, $15 minimum, I paid $25 to be safe, when the statement cycle closed they tacked on $3.82 in interest. Reported a high balance of $300, current balance of $278.
When Cap 1 bumps me up to a $500 CL in 3 months, I'm going to just cash a convenience check, then repay it a few days later. To game Cap 1, methinks ya don't need to have a near maxed out balance reported in order to get your maxed out high balance reported.