It all sounds a bit strange. I think it should be remembered that in order to learn true kart control and therefore become a better driver, less grip is better! In fact, if conditions are changeable and will not give me any set up information (in terms of wet/dry), then I'll always choose to go out on slicks.
The reason is simple - you're not learning how to set the kart up whatsoever. But you're certainly learning how to drive it properly and how to control it.
As far as the tyres go: there is a little printed number in a long oval on the sidewall of each tyre. The two numbers at the start of this long number are the year that the tyre was produced. For example: 05...... is 2005 and 00..... is 2010. I would suspect you have 2010 wets as you said you bought them from Tal-Ko at the start of the year. Give them a little while to bed in and they'll be alright.
The usual difference that people quote between the old Rotax Vegas and the Maxxis is ~3 seconds per lap.
I can only suggest that the other 3 seconds are owing to your sons newness to the class and perhaps lack of experience in such slippery conditions.
I would also suggest narrowing your rear rims as the Maxxis have a narrower tread than the Vegas (try a 150 rear instead of a 180).
Will
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