Looking forward to hearing your views on the Metzelers, Ryan.
Sorry the Mityvac didn't work out for you. Did you first seal the bleed nipple threads with PTFE tape? Without that, the pump draws air in past the threads and you lose the vacuum.
Don't forget to push the pistons fully back into the calipers before you start (to purge the ABS pump). I don't think you should need to disturb the ABS unit itself because, unlike the rear brake, the highest point in the front braking circuit is the master cylinder so any air in the system should rise to that point. Have you tried bleeding at the master cylinder nipple yet?
Keep persevering (both my front and rear brakes are super firm now) and good luck!
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