I will definitely use mma gloves next time
Don't wear any gloves.
They wreck your technique anyway , they get in the way of doing proper Tan Sau's and basically limit you to doing a lot of Pak Sau's.
As it has been pointed out already you have a problem with throwing strikes out of range , one way to fix that is to both wear chest protectors and only strike the chest.
Make sure everytime that you step into hit , your arm is still in the optimum angle just before you strike.
Another very good exercise for this is to start off chain punching lightly on your partners chest , he does not strike at all his job is to stay very mobile and just move randomly in any direction.
Your job is to stay with him as he dances around and to keep punching him in the chest , making sure that you are constantly staying in close and in range.
Do not let your punches lose contact with him.
One other thing I noticed is that you tend to engage in some type of hand fencing thing where he throws out a probing type of punch from out of range and you stay at a distance messing around with his hands , don't do this.
Soon as you make contact with his hand , latch / cut down , or Pak Sau that thing out the way and move in and hit him.
Finally I would make the hitting the head thing , even with head gear on , a very, very occasional event.
Trust me , there are more enjoyable ways to lose brain cells and it is no fun when you are older and walk into a room and can't remember why the the hell you walked in there.