I also need to add. I bought this TH 46 because I have 3 friends and they each have a TH 75 2 out of 3 run great. 1 is new and just went thru the break in procedure and only has 3 flights on it. 2 dead sticks (low end still needs adjust)
On my 46 I have tried an OS #8 plug (3 of them) 4 tower hobby plugs, a used plug w/idle bar out of a very good running K&B 61
and nothing worked to make it better. It needs better compression.