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I'd certainly start with pads and fluid. You might pick up some heat-indicating paint and place some on the edges of the rotors to see how effective your ducting is, when you get there. Put some on the rear rotors, too. It would be interesting to see the temp difference between the front/rear rotors.
The next escalation step I'd try would be slotting (not drilling) the rotors. The benefits may be marginal, but it's pretty cheap to do.
After that, the next step I'd try would be vented front rotors, using a pair of Mueller's hubs. Talk to Eric Shea about widening spacers for your stock front calipers to use with the vented rotors. I personally think this is the best low-buck solution, since it involves changing the fewest parts, and as you note, the stock 17mm MC and stock calipers with good pads provide plenty of stopping power. You just need to find a way to shed the extra heat generated by track abuse.
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