Well first it's not interference from the neighbouring transponders that is the problem, but that the dish is too small. And even if it were the neighbouring transponders that is irrelevant because all those transponders are going to move to 2F and will be at a similar level.
You did not get my point....
I'm saying that at present time reception of 11025H is probably worst than when everything is migrated to 2F.
At present time the 2 adjacent transponders of 11023H on the 1N are coming very strong in Portugal and I think this is preventing the reception of 2F that is very weak.
A larger dish would not help much in this case because it would also amplify further the 1N transponders, maintaining the C/N level on 11023.
From my readings the power I'm getting on 11025H is about the same I see for 12480V on the 2A NB that I'm receiving. But for the latest there are no strong adjacent transponders.
So, I have some hope that the situation can get a bit better in the fringe 2F footprint areas where the 1N is currently strong.