This is the only game highlight tape where you can clearly see whether you were blitzing or not on your big defensive plays and 80% of them were blitzes:
https://www.youtube.com/watch?v=U9qsAO8_rWg
That shows all the sacks and INTs from the Mich game I believe and there was only one time you didn't blitz. And beyond that, you were QB spying, which is almost the same thing depending on the read. UCLA highlights are less clear but you can still see non-defensive lineman Utah players in the backfield on most of those sack/TFL highlights, which means you were most likely blitzing those times as well. You clearly blitz plenty. Your line is good, but you definitely are not only sending 4 linemen and getting to the QB if those two game highlights are any indication. Quite the opposite.
I've personally only seen the Washington State game in its entirety, where you didn't blitz at all really, but that just means your coaches thought it was better to play that quick release offense by staying stable in that zone, but that's not your general philosophy.