I think it's awesome you've taken it upon yourself to do all this experimenting! i bet you gt s lot of interesting results.
Absolutely fun! Once you go down that road there's no looking back. The blending tobaccos sold by most of the major manufacturers are, in most cases, the absolute cheapest and lowest-quality leaf they have. It's garbage compared to the quality of tobacco that you strip and shred yourself. I'm sure there has to be bad whole leaf out there somewhere but I've never had it.
Of course you have to be honest with yourself. There are some trials that end up in the garbage. But on average I think approximately 80% of my whole leaf experiments are great--not mediocre, but
great. I'd say that my trials with store-bought blending leaf yielded a "passable" smoking mixture maybe 10% and the rest was unsmokable garbage.
One interesting thing, though, is that it's very labor intensive. You couldn't possibly go into business selling
sui generis tobacco mixtures without the proper equipment.
Here's my process for Virginia cut plug, which is my base for many blends.