Joined: Feb 2012
Posts: 19,353
Likes: 5,471
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
I have done some of the same but with the ST/DT angle too large by around the same amount. I squeezed the tube in (well, I actually used long Omar's bending bars slid inside the tubes touching in the BB). I got the needed spread but suffered a collapse bulge in the seat tube's front just above the shell.
Now this was when I was building some version of the "hockey stick" process and using brass for the seat tube filler. I continued to complete the frame, no one spotted the issue unless I pointed it out. I don't remember how many years I kept it but it's long gone now.
As I suggested before you do anything get replacements. Then you're free to do whatever you decide on. Andy
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AndrewRStewart