Without revealing any personal or team secrets regarding spring rates, is there any particular range of spring rate that works well with the NA Miatas for ITA competition?

I come from a SOLO back ground and what works well for me there may not in ITA. I'm just trying to get a little feedback to make sure I'm not making a big mistake putting on softer springs from the 700/325lb springs that came on the car.

Any advice would greatly be appreciated.