Ok, so Mastercool sent out the new die set, so here is latest.
New dies, they seem to hold the tube much better closer to the correct OD of the tube, so it does not mar the tube up so much compared to the first set, and the critical bubble end has held its shape, and the results speak for themselves, perfect flares and the tube nuts slide down perfectly.
I have to say I'm much happier with these results.
