@traudio : Ok, then digital is ok so the problem is with analog and that could beaproblem in the V10 or in the H390 running analog.
Why insist I in the overall issue? because those 46dbs of gain ( repeat ) is totally enough for any integrated to achieve over 95dbs on SPL no matters what.
The designer of your cartridge spec said:
" suggested preamp gain: 38-44db "
and you have 46db.
With all respect looking for more gain makes no sense at all. Again, something is wrong down there. Maybe the loadimpedance or in the MM stage circuitor something around it.
You can ask directly to Hegel/Soundsmith.
Anyway, your " call ". I'm trying only to help you.
Maybe some one in this forum can help about with out need you buy a new cartridge.If I was you I ask and explain all to Hegel and if for them what you are experienced is ok then buy the MC cartridge.
R.