As a carpenter I can assure you that most people will not see what you think is a flaw. WE are our own toughest critics. And my wife is still using the checkbook cover I made her 30 years ago.
My guess would be how the hide is treated before tanning. Also the ingredients used in the tanning. I had double shoulder from Tandy that smelled like piss when it was wet.
Looks pretty good. Do you have access to a hair blade or hair 'pen'? Also, cutting in major groups of hair will give more definition. This is NOT my work, but it will show what I'm talking about.
I use a dauber most of the time. Up and down once, back and forth once. And finally spiraling out from the center. The looks will even out with bit of buffing to remove excess pigment and a light oiling.