HYB: seedling form - variability?

This question is mostly for those of you working with TBs with modern (wide) form.
If you cross two TBs with excellent width, what kind of variability of width do you get in the seedlings? I'm guessing that depends on the parents, with some combinations giving a higher percentage of wide blooms than others. 

??
==>>Which leads to my 'real' question - are there any parents that seem to be better at producing a higher percentage of wide children than others?
Working with 'retro' breeding lines, by crossing with wide pollen donors, sometimes there is quite a bit of improvement in width, sometimes not as much. There are generally small numbers of surviving seedlings from any given cross, so I haven't been able to tell if width in survivors is a random thing or if some pollen donors are 'better' at giving width to seedlings than others. 

[I knew I hadn't really run out of questions to ask....]
Sure, Betty, I've done <lots> of crosses already this spring - in my head and on paper ;-)
Brought some of the fall planted ("nature's method") seedling pots indoors several days ago. Sprouts are coming up in a few pots this morning.
So if you get <really> impatient, you could always bring them indoors for a few days..... 
--
Linda Mann east Tennessee USA zone 7/8
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