25% is fine with crop saver. Safe to 30% . Only heats up slightly for first 2 weeks. No caramelization.IMO you shouldn't move hay for 4-5 months after its been baled with additive, especially if you're using the full rate. Stick it in a shed and leave it there, it needs to go through a curing process, warm up a bit and then cool down. And the acid breaks down too I expect, so you lose the smell as well. If I've baled hay with lots of additive on it I won't send it out to customers until nearly Christmas. And I've never had any complaints, in fact I had one lot that I had to bale in an emergency that was up to 25% when baled was chosen by several customers as what their horses liked the best, over far 'better' hay.