2014 yz450 popping when hot

My bike has 4 hour on it.I have a yosh silencer and bike was remap by tokoy mods.Bike runs good till it gets hot.When I let off the gas my bike backfires real bad and and it feels like it is going to bog.I checked for exhaust leaks and it is all good.I use good gas too.Any suggestions will help

What fuel you using? If you run a fuel that's is high is oxygen it will run lean and need more fuel mapped in. Same happened to me with 50% C10 and 50% U4

I am running cam 2 gas at 100 octane mixed with reg gas.

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