I cannot provide exact comments on your problem.

But I have experience with the Hexagon vs the E3DV6. I originally started using the Hexagon hotend and had a lot of issues with filament sticking to the inside of the nozzle especially when changing filament. So I changed to the E3DV6 and have had no issues. I love the E3DV6 and would not hesitate to purchase another one. The design between the two are night and day, and the machining on the E3DV6 is sleek and clean.