I wouldn't worry too much, when I talked to Rusty, he had done extensive testing of the TW to the f5 I believe he said of it. It will never be perfectly stable, but I grew cookie wreck out and east coast cookie wreck out(chem and tw genes), never had one hermie on me, indoor small tent grower. I hear it about the GG4 too, but most crosses I see out of that one or even the fems are rock solid. Nothing is really stable these days, so to speak. But just because it says something on paper, in your garden, that may not be the case, just sayin. Lots of hypothetical theory goes on, realistic and gardening experience counts too. imho