Where do we go from here?

Octaves, using every available interval you can, tune down to the first note and up to the 88th note. Use 4ths, 5ths, 6ths, 10ths, and extend those same intervals 1 octave and listen again. Use those notes you have already tuned in the temperament area as the absolute reference point. Recheck all of your work to be sure no strings have moved since you tuned them.