I believe that you have a standard bridge rectifier now. It is using the full AC swing of the PT. The changes would not alter the current demands on the PT. The only changes would be placing the dropping resistor between the rectifier and ground and eliminating the filtered B+ voltage feed going to the PT secondary center tap. I'm 99% sure that the bias supply is a separate winding with no connection to the secondary winding. You could confirm this by testing for continuity between the bias winding and the secondary winding. The F&T capacitors that you currently have are fine. This mod, as well as the others, is totally optional. If this is outside your comfort range, then don't do it. I was looking for a way to reduce the B+ from 500+ volts DC feeding the 6L6s down to an operating range that IMO is less stressful on the tubes. IMO 500 volts is way too high and requires a stone cold bias for them to operate at this voltage.