I've been playing around with TMax RS which I think is much cheaper to use than TMax Developer which I'm a fan of. But the instructions say, add 1.5 oz per roll of fill, yet the exhaustion rate is 2 oz per roll. Right now, I'm using 1/2 gallon of working solution with 1/2 gallon of replenishment solution, so when my replenishment stock is up, I'll likely mix box a new working and replenishment stock. But is it me, or if I continued replenishing the working stock the way they say, it will eventually stop working? Am I the only one that sees an issue with the math, or am I missing something?