wad 300b pse monoblocks feedback problem

[Princo]

Just finished building 300b monoblocks, all is fine when FB not connected, but when FB connected the bias voltages are all over the place.(see attached )

Have checked wiring numerous times and all seems fine, both amps have the same issue so it must be something i've done but i just cant figure it out.

The rectifier is a 5AR4 so the voltages are a little higher than design