Using dedicated power supplies versus using pulse transformers?
Without further information in your question the following may be of interest. See Multiple MOSFET based AC switching circuits on the same supply where I posted the same response but haven't heard whether it works or not.



You may be able to solve the problem, eliminate the isolated power supplies and simplify your circuit using a photovoltaic MOSFET driver.



Figure 1. Extract from VOM1271 datasheet.

I haven't studied this and would be interested in comments on performance of these devices.