I doubt you should worry about putting more in your Roth accounts. You have great balances in your 401(k)s... but if you're planning on retiring soon ("in a few years...") you're not going to pay a very high tax rate in retirement. Probably the pre-SS years, you'll pay no tax?
The logic is, if you'll pay a lower marginal tax rate in retirement than you'll pay on the conversion, you don't save money by paying lots of taxes now so you can avoid a little bit of taxes later on.
PS. One thing I'd be looking at with your balances are your expense ratios... it'll make a big difference if can cut your expenses .5% a year... That might save you $5K a year at point you retire.