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definitely pay off the low balance cards...if they are $25 minimum payment, that's $75 positive swing to your DTI. as far as the other two...are you sure that the minimum balance will not increase because the balance increases? from a pure DTI perspective, it may be counterproductive to BT.
are you paying interest on those two balances that you are looking to transfer? if so, you should try and get a BT offer from your existing cards and use that.....from a pure financial decision, it's a better option.
but definitely pay off those low balances. have you ran your DTI calculations to see where you will be if you just paid off the low balance cards?