no, idle quantity is calculated identical to the 5.5.
Idle quality is also a question of element quality, which is poor for the after market 7 mm.
With full load screw adjusted accordingly the 7.5 deliver the same amount of fuel, but can also deliver approx. 100ccm/1000 rev within the same range of end of delivery compared to the 5.5.
As soon as I have my 6.5 MW elements ready (the Ms will be ready later) I will "test" the capability of the new bench guy in setting the governor.
This guy is successfully doing some IPs for race trucks but never thought of using custom elements (up to now).

Tom