I'd check all the brake hoses, make sure there isn't any splits, especially in the rear lines.
What was the Coilpack issue about? You had them renewed recently?
How long has the fluid been in the car and are you sure all the old fluid was removed when it was changed. Brake fluid is hygroscopic and absorbs moisture, If the fluid gets hot enough the water boils and you end up with a soft pedal.
Usually these issues are resolved by fully bleeding the sytem and replacing the fluid. Difficult to do at a track day but it sounds like you have other issues. that are not fixable at the track.
I'd be very surprised if you boiled RBF660 tbh. I'd wager it's something else that's failing on your brake set up first or as said above old fluid....RBF660 should be changed every year unlike the RBF600 which can suffice the regular 2 year intervals
What's the rest of your brake set up again other than the RBF660 fluid?
If you have your pedal feel back and everything seems back to normal it sounds as though you had heat fade. How long were you on track for before this occurred?
tbh nick after a few sessions with the coach guy it seems im using the brakes far to much in between bends which were taken faster at consistant speeds over the on off driving i was doung if you see what i mean
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