I have DE-wired a large transformer. 4X4X5 (just the steel) inches, and plan to wind two layers of #21 gauge enamel wire over the "center E" for the control winding. Does this sound like overkill to saturate the core? Then I plan to wind the rest of it with #12 gauge to fill rest of the core. Anyone made one of these before? Denis Despins KC6TRW