Brakes in rain and speed in convertible

[VLADDS@domain.elided]

When i had my VW Scirocco (last edition but not 16 v), i had no bad brake 
problems in rain. However, when i replaced the stock alloys with koenigs 
(they barely had some rods, as connection between center and rim), I started 
experiencing exactly this problem, the lack of brakes for like 1 second on 
heavy rain, while doing 60, on the parkway. The only way to fix it was to 
apply brake every 5 minutes, to wipe the rotors clean (i think a new Mercedes 
has that automated). I think it could be possible that slotting would 
evacuate the water.
My question is: If you have a potent convertible, something capable of more 
than 125 Mph, what would be the configuration to make a run of that speed, 
top up or down?
Sorry for my ignorance in this matter.
Vlad
'91 164L
'85 Maserati Biturbo S

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