rafaelpinto,
I will say that the biggest improvement I've seen in my hoppy beers occurred after I started being ultra protective about oxygen exposure during bottling. I used to be careful, but careful wasn't good enough. Here's what I do:
1) Cover the mouths of the bottles with a square of tin foil and dry heat sterilize. Allow the bottles to cool back to room temperature overnight in the oven. Keep the foil in place.
2) On bottling day, lift the foil, drop a piece of dry ice into each bottle, and replace the foil. Let the ice sublimate.
3) Repeat step 2 and add carbonation drops (a pre measured dose of bottling sugar).
4) After the dry ice used in #3 sublimates, fill the bottles from the CO2 purged bottling bucket (see my previous comment on this).
5) After filling a bottle, drop a very small piece of dry ice into the bottle. The ice will sink and cause the beer to foam. If the ice is too big, the foam will make a bit of a mess.
6) Cap and bottle condition as usual.
Doing the above made huge improvements to my IPAs but it is kind of tedious (but so is bottling). Looking forward to kegging some day.