Best cassette/wheels for imc

Hi, I am doing IMC on aug 30 and am wondering what would be the best cassette/wheels to use? I currently have a sram 11-28 on a set of flashpoints 60/80 combo or a 12-27 on a set of heds 60/90 combo. I am 6’4, weigh about 187 lbs and am an average cyclist. I appreciate any and all suggestions!

Cheers

11-28.

Between the wheels, up to you. I’d go with the flashpoints, but I’m biased.

Having ridden this course about a dozen times I would go with the 11/28 and really either wheelset is great. I think you are splitting hairs on the wheels.