All these races being cancelled is the main reason I sold the SST and will probably finish out the year with a heavy lake boat.
I used a cool wrap most of the time sitting at the holding rope. Don't know where you can get one, these days, but its a gell filled neck wrap that you put in your ice chest, get it cold and then right before going to the water put it around your neck. By the way, there is no shade on the water in Waco.
As far as the experience of racing SDBA or IHBA, be careful. The adrenial rush is addictive, the first time your pairing comes up and the track turns green, your heart rate has totally erased all memory of the last 30 minutes sitting on the holding rope in 100 degree temp. Its a disease and there is no cure!