Is here any user of Griego Alessi 7F?

I recently swiched of from Bach 5g to Alessi 7D

The rim of 7d is very confortable but the sound was better on my 5g, i like the 7 series rim very much and i want to know if i should buy The Alessi 7E or Alessi 7F, from 7D is a good difference to 7E? Is worth buyng the 7E? Or buy direct the 7F?

I play mostly the 1st trombone in orchestra.