This has worked good for me on several sleds. I just fill entire handle bars with silicone they stay just as warm or warmer without taking grips off.
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I installed cork and high output RSI heaters on my 2013 pro rmk. Way better than the stock heaters for sure. My 2018 Axys all stock is just as good as that setup. Both are stock protaper bars
So they must of changed something. Just don't know what year. Maybe foam backer. I don't remember any foam on last pro bars I did but that was on a 2011 pro.