Anyone know why the 95s are prone to do this? Perhaps the cooling system isn't
quite up to the job?

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Spud

Maybe the smell is the heat from the resistor grids being dissipated when using rheostatic braking? I don't know if the Northern line can accept regenerative braking. (i.e sending the energy collected back to the supply source)

I was on the Northern Line the other day but didn't notice any peculiar smells, you can definitely tell the 95TS performance has been upgraded since the introduction of TBTC on the Northern Line.

The Northern Line 95TS use newer AC traction motors and IGBT control despite being older, whilst the Jubilee Line 96TS use DC traction motors and GTO control despite being newer - this was because the design specs. for the JLE Extension were frozen back in the early '90s before widespread use of AC technology.

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Schnuzelbug