Don't know where you are in your career/family situation, but I'd seriously look at $25K to bring 3PH in. If you're bumping max on your 1PH service, you're going to have to upgrade it anyway, so put the upgrade $ towards the 3PH. Read the fine print and ask questions of your utility supplier first - min charges, demand charges, etc.

Having said that, I know of many, many TopDry's around me running on converters - some on rotary's, some on static/digital systems. I've never heard of the plethora of problems that you seem to have encountered. That's why I wondered about electricity 'quality', or voltage drop under load, yadda, yadda...

Mind sharing what state/province you're located in?

Ken