I think the issue is that a lot of people don't realise our cars are a different offset to the Spits and Heralds. Trying to remember who it was that found that out fitting Spit wheels to a Dolly.
That said, a company selling wheels should know really.
Though having gone over it again, I worked out the offset wrong originally

, if it'll rub, it will be on the outside, not the inside like I first thought. Must have had a brain fart that day, though I have been looking into it more myself for some other wheels I adore (not enough to pay the $430 per rim though, ouch), so I've semi cracked it now.
It's 19mm further
away from the brake drum than a Sprint wheel will be. So yes, I can see why you're having problems, even on a 5.5j rim.
At this stage, a refund is highly unlikely (besides, they look awesome), but I'd still be inclined to phone the company, have a whinge and try and get a hefty sum back. Then on the car itself, remove the crud catching lip and hope they fit better!
At the end of the day, Midland wheels cocked up, lets see how good a company they really are...
I understand what you mean about drilling bolts now! Good luck getting the snapped extractor out... That's going to be tricky.
I've heard about a fair few of them going ping, trying to avoid using my set, very much so a last resort I feel.