Sparkplug options?

Yes, I know that this has been covered many times before and I have trawled through most of the old threads and am now completely confused…

What are the sparkplug options for the S1 Exige(192)?

Popular opinion says Champion RC6 YCC but Elise-parts have just sent me 4 of the hotter RC8 PYP (as used in the standard lower power engines)

Do I try fitting the hotter plugs and see how the car behaves or should I send them back and find some of the cooler RC6s?

Any suggestions gratefully received!

RC8PYP might be a bit hot for hard use.

I use Bosch FR56 (a touch cooler than Exige ones) on my DVAed Elise and happy with them.