your front tires can drag water pretty far, even if there's no tread to help sop up the water. you were driving over partially moistened track, traction was surely lacking.
talk to the track guys and let em know whats up. hard for em to know what you want to do if you dont tel em.
they are safety minded enough to make sure you run by yourself... but not safety minded enough to keep you from dragging water into a slip n slide....
Don't think it was the problem honestly. I'd love to blame the track... although a good track I would have been at least able to 1/8 mile 100% throttle. However the main problem wasn't traction. The car was unstable over 100 mph even off the throttle. Very twitchy. It went straight but any steering input would cause a big direction change. Lack of traction at 300 feet did make the problem way worse.
Traction off the line was great. No complaints. I could have probably 60 foot 1.4s but after 100 feet the sticky groove got much narrower and at 300 feet you could barely see it. You can see that on the video. There were not enough cars there to make the track sticky past 300 feet.
If water was a problem off the line would have been slippery too. But the radial cars, those could make the track moist possibly so yes they should force people around the water box with street radials, like other tracks do.