DD16 oil pressure surging when cool starting. (short vid)

Quick back story. This is a new to me Coronado (factory not glider) DD16 at 600hp.
I changed over from conventional oil to full synthetic. First change I only ran 10k miles as the transition change I'll call it. Used a OEM filter.
This change I went with the Baldwin filter that has multiple pleat separating bands. Not that I had any issue with the OE filter, but may as well try to improve when possible.
Usually I start the truck, make sure the pressures are coming up, then step out. I had not noticed any gauge surging before, but.....
So, only about 30F out, not cold, just cool. Running Delvac Extreme 15w40 full syn. For whatever reason, I noticed this surging a bit. It smooths out in about 30 to 40 seconds or so.
I'm wondering, do you think this is the filter bypass opening and closing?
https://www.youtube.com/shorts/6AnKkxT-e9I?feature=share

 

Once warm, starting up the gauge does not hunt. This only happens first start of the day. After that, any re-starts are fine, and driving, the gauge acts perfect. I should see what the micron size is on OE filters vs. the Baldwin.

 

And glow plug relays.