Usually, wet conditions provoke understeer. That is often caused (but not the ONLY cause) by too LITTLE weight over the front tyres. In your case, you have too much power-oversteer.... that would imply that you MAY already have the weight too far forward. Have you measure this?
Secondly, grip in the wet can be enhanced by RAISING the CofG..... you can do this simply by rasing the seat. That raised CofG caused more 'force' to be applied to the outside tyres and thus more grip.
Get your lad to test the effect of weight distribution in the wet by a simple method.... lean OVER the steering wheel when he wants to 'turn-in' and then LEAN BACK when he's leaving he corner.... which transfers the weight to the rears. He'll be SHOCKED by the strength of the effect and it'll give him an insight into the effects of weight distribution.
You're right: get him to control the throttle: the correct term is 'modulate' the throttle. Apply the power that the kart can use.... and no more! Also, get him to sit 'softer' (looser) in the kart in the wet, this softens all the 'shock loading' on each bump and turn which lets the tyres work better. Wet weather driving is about driving more sympathetically. For a 'grown up', I'd say, 'treat it like a woman': cajole, persuade and flatter and you MAY get somewhere.... shout at her or force her or beat he with a stick and you'll get NOTHING! Translate that to and appropriately aged metaphor for your son's level of understanding.....!
Ian
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