The thing no-one is taking into account here is powerstroke.

The 7.5" bow may have an overdraw, but the powerstroke remains the same.

Torque is the big problem with an overdraw.

As far as the brace height/forgivness question, I've come to find it relies mainly on three things: how well the bow is designed, how comfy it is for you, and how good your form is. Far too many variable within those three variables to draw any absolutes.

My Martin Rage XRG w/ Z cams had a 5 & 7/8" brace and was very easy to shoot. Had sveral roboinhoods with it and could always pick it upa nd drive tacks even after not shooting it for a few months.

My ExVFT w/ 6 & 5 /8" brace is pretty darn easy to shoot.

Had two 8" plus brace height bows in recent years that shot horribly for me (or I for them ).

Comfort, good form & good bow design is key.