Great job Kim!!
You were so detailed in your original post. Thank you for that! I've got to say though that you had an extraordinarily difficult 1st deal and not all wholesale deals with be like that.
And I recommend that you try "Click2Mail" instead of Vista Print. If you use "Click2Mail" and you use their postcard with your copy on it, then you will save money. A typical postcard will cost about .47 each. No fancy photos, glossy, etc...just a plain black ink on white or green card stock....they may have yellow too??
Meanwhile, by putting the "assignment" clause in your contract, that covered you. That attorney friend was a good move for you. My attorney makes me use something like that too....and in my state of Texas, all contracts are assignable.
Since you only mailed out postcards twice and the first batch was ruined but you rec'd a deal out of the second batch of 376, then you are doing great. My mail outs are in the 1000 - 1500 range each time and if I'm lucky I'll get 1 - 2% calls. And then out of that 2 - 3 deals. So if I were you, I'd keep on doing what you are doing with a few changes to your original plan.
Great post.