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It will be difficult to change the architecture now - not much room for more caps. I am using an H-bridge. Changing bus voltage is tough as all components are rated for the 340v.
It was a half bridge indeed not a H-bridge that you mentioned in the tuning for maximum power thread (unless you're building several coils?). With a half bridge, running at higher bus voltage will give you significantly better performance with your previous MMC (e.g. usually output from a variac will go up to 140VAC giving you ~400V on the bus). Also you could have combined all the threads you created for this coil into one project thread instead. Good job getting it working.
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New Coil
