Yes that's the conclusion.

My Iswara rear drums, I've brake until front glowing 500+c, rear also no overheat/fade.

Only time my rear drums faded is Sepang.

Also try to understand that when weight is shifted to the front, the rear is less effective.

An example:

An exaggerated example:

When the rear tire leaves the ground, it's braking is zero, and if no abs/electronics, it's almost a guaranteed immediate lock