Hmm... I'm not sure that the additional caster will actually help, indeed I think it may exacerbate your problem... I'd actually adjust the camber first (increase it) and perhaps add a little toe in. If the track is relatively smooth these changes shouldn't effect straight line stability too much.
Adding caster will "push" the car into corners a little more, if you car's already understeering on deceleration (before the apex) then additional caster can make this worse (however this depends on whether it's pitch, roll or lack of mechanical grip that's causing the initial understeer).
Since it's a small, tight track and you're understeering you could also try a front one-way. Before I did this however I'd try and move the roll centre forward a bit by stiffening the rear end... if you like that "feel" then you might like the one-way.
If you think lateral movement or roll is making the car slide wide before the apex then try a sway bars (heavy front, light rear - don't use one without the other).
If it's only understeering on power after the apex then start with the mechanical grip side... tyres and suspension.
And remember... one change at a time so you know what's going on.
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