Cal, I advised against this too him once in a text message a couple months back. haha
Thats the problem with kids today, despite how many old farts tell them "No", they never listen
Gennaro - I can't tell from the pictures, but it seem the rear of your tank is sitting above the retention tab? Or is the rubber tab not in place? Perhaps an easier/better modification is to cut and lower the front mounting sticks for your tank. This would increase the top clamp/tank spacing, give you that forward pitch aesthetic, and maybe help with relocating the petcock to the front half of the tank as it would now be the lowest point. You'd have to probably be close to the interior tunnel for the petcock to clear the valve cover and avoid the coils. Or is there a different model of petcock that might work if you swap the bung?