I think it varies from person to person, but that's certainly what happenns to me. I get the blanching just after a feed and then it subsides, but cna reappear and subside several times between feeds.
Someone told me that warm air helps the bloodflow to the blood vessels and turns them pink again. I did find that breathing warm air onto my nipple ends helped a bit, though is not the easiest thing to do and H did find it hilarious watching me breathe heavily into my bra 
You sound exactly like me, I'm sure it was Noah's latch that was the main problem, added to the clamping. It does seem to have all but gone now though, so there is light....
I also find that Noah breaks suction with my breast when the milk is flowing the fastest. He doesn't come off the boob at all, but I can hear him lose suction and then next time he sucks he has to draw the nipple out all over again, and that certainly added to the soreness.