If feeding that amount of rice bran I wonder how much starch and protein it includes that you'd also be feeding and maybe not wanting?
Feeding the straight oil as in cool calories would mean just oil which is all you want?
Yep! Cool Calories is 100% fat and nothing else. It's just vegetable oil in dry form. Much more simple that way. Rice bran is great for "normal" horses, but there are some complications with PSSM ponies.