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I have a basic concern about this assembly, which

I take to be an inrush current limiter (by way of rail

dV/dt ramp rate).

Your turnon plot appears to take 2 seconds to

slew. That's a long time to be holding a power

MOSFET linear. I would worry about the load

/ filter bank being able to cook the channel

or neck. I think at the least, you want to qualify

the MOSFETs you picked for the Joule energy

they take, and try to figure (or better, measure)

local temp rise and deduce reliability.

Or maybe you do something like a compound

output, use big dumb power BJTs to handle the

linear interval (they are made for it, no fancy

assumptions that they are "either on or off"

embedded in the conditions) and hard-switch

the MOSFETs once the two BJTs top and bottom

have buried into saturation. Everybody working

how they like to work.