That's an interesting thought, re scape thickness. I've casually noticed that some of the daylilies of mine that tend to lean, also have slender scapes; a few of the diploids come to mind. I would think that the tets would overall have thicker scapes, but a few of my tets lean, too.
Also, I suspect that having large flowers on top of tall scapes contributes to lean. 'Sears Tower' starts out okay here, but once it starts to bloom, the scapes start to lean with the weight of the bloom(s). 'Big Birds Friend' also leans.
I remember once, a long time ago, reading about spiders - I think this was in the context of the earlier days of tet spiders, and on someone's hybridizing program. The person writing commented about how people touring a garden or nursery would pick the scape off the ground to look at the flower, lay the scape back down again, and buy the plant! That was how weak the scapes were. So that adds another facet to the problem... is it that leaning scapes are (also, not solely) genetically related to spiders/spidery daylilies, as opposed to simply large flowers? The ones of mine that lean are mostly (not entirely) spidery, or UF. Hmmm.
