I have used long points before as I throw my darts pretty hard and I didnt like my darts burying in the board up to the barrel.
I never really noticed any difference in the balance, but I dont think about the balance when I do things like that.
I would suggest that if you put longer points in, that you experiment with stem lengths.
Throw say 100 darts with medium stems, then throw 100 with short stems and see how they feel.
When I set a new set of darts up, I look at the overall length of my dart. Then I use a length stem that makes the dart a similar length to my old set.