Turns out when I went back to my Terran campaign, it took me directly to a checkpoint on The Dig right before the air attack that broke my northern base entrance, so I was able to back my siege tanks off (they were too far forward in the first place) and put the laser to work, then finished the mission.
The Media Blitz mastery achievement (complete the mission in 20 minutes, minus the 5 you're controlling the Odin so 15 really) continues to elude me. Lose so much time having to defend my base even following a guide I saw on youtube. Guess I need to practice my timing some more. Really wish WoL had master archives like the later campaigns do, I noticed you can cheese a few missions by drop podding upgraded specters at objectives, but I took tech reactors like any sane person would, and I went with ghosts this playthrough since neither one really matters and I wanted to see the cutscene of Tychus getting thrown around by the voodoo doll. Also fucked up Maw of the Void mastery (yet again) by being sloppy and losing a goddamn dark templar inside the rip field. To make things worse I played for like 10 more minutes before I realized I had already blown the achievement.
On the LotV side, I can't seem to get base defenses established on the right side for Purity of Purpose, which is getting through the mission without using Kerrigan to kill units. I can handle the left side with no real problem but on the right side, even with planetary fortresses and siege tanks, that first enemy attack wave breaks right through after steamrolling Artanis. Mission would be so unbelievably different if Artanis was actually capable of holding off the first goddamn attack. Guess I just need to keep at it. Haven't worked on HotS in a bit, all I have left there is the masteries and brutals for the last 3 missions on Korhal.
The super units you get in HotS and LotV really make the higher difficulties so much easier compared to your units in WoL.