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He knows more than me but even I've done my Maguras so I know there's not much else to be done to them. Maybe the system just needs to settle and I'll do a top-up bleed with the levers squished like the article linked. The pistons move as soon as the levers move they're just too far from the disc. Looks like I'll be fucking off the TCR altogether or riding something else anyway but I've just lost another weekend.
http://forums.roadbikereview.com/components-wrenching/shimano-r785-disc-levers-have-excessive-free-stroke-343759.html
After you do a complete, thorough, and correct bleed, pump the lever a few times with the system closed. Then (keeping the lever end closed) open the bleed valve at the caliper and force some more fluid into the caliper. Don't push the syringe as hard as you can or anything, but push hard enough that you can see and feel a small amount of fluid enter the caliper. Close valve and check lever pull now. I have done this a few times on various shimano systems to get a really "high and hard" lever. Seems to work.