Is the boot required for the copperhead?  I have a Ender 3V2 with Copperhead Heartbreak, and I recently added the copperhead hot block and silicone boot.  Problem I am having is cooling  Since the copperhead is much wider than the stock block, I am having a hard time finding a cooling duct that clears  With the boot on it blocks it a little.  With the boot off it's fine.  The beefy boot is nice, but I think it's blocking me a little.  

I also have a Bondtech CHT nozzle which is 12.5mm I believe.  Im considering going with the gamma master Ap3x since it's 14.5mm and it will give a little more clearance.  Everyone says just go with a different hot end....but I am not ditching my heatbreak.  I have tried 4 other hotends just for test, and nothing performs better than this one.  So I am sticking with the slice stuff!