4kW PFC inductor design looks diabolical (5 stacked)

[cupoftea]

Hi,
I need to do a PFC inductor for 4kW, 60kHz, 180VAC, 400V. There will be three PFC inductors the same, and the control will swap over every 10ms so they don’t overheat. (like in the attached LTspice). Even like this, the windings loss considering just DC, will be 12W (2 parallel strands of 1mm ECW)

The only in stock torroid in the world that I can find for this is Mollypermalloy MP-225125-2.

Mollypermalloy MP-225125-2 Torroid:
https://datasheets.micrometals.com/MP-225125-2-DataSheet.pdf

But as the attached shows, I would need 5 of these stacked, with 19 turns around it. I believe this is too much stacking. Do you know of where I can source bigger torrroids with more cross section area, so I only have to stack 2 or 3?

 

[Easy peasy]

Consider an interleaved design - this will reduce total inductor volume considerably, as inductor volume is directly related to L.I^2, so for 3 say smaller I^2 is far less ....