I grow both so will take a look for any significant difference. The only other thing I can suggest is testing the pollen on OT lilies but you have to be careful and follow protocol to prevent other pollen from messing up your results. That is to say, foil cap before and after pollination with your BB pollen.
Just my experience here, my tetraploid lilies don't seem to grow any taller than the other lilies. They just have heavier substance both petals and leaves. Especially true of the Ed McRae tet trumpets I have grown.
