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I don't have the service lit for that set here, but generally speaking, a horizontal efficiency coil is not used to adjust width. It is, on most sets, a fairly critical adjustment used to tune the horizontal output circuit to resonance.
If we are indeed talking about the same thing, the main things affected are the horizontal output tube and the flyback, both of which are likely to get destroyed quickly if this is set wrong. Generally speaking, they tune like transmitters. If you are very far off resonance, the tube and plate tank (in this case the horiz. output and the flyback) will draw way too much current.
If you have changed that coil setting, I would read up on the procedure before you turn it on again. It should be in the Sams. Generally speaking, this will involve checking the horizontal output current while tuning that coil, and checking the 6bk4 current while setting the "HV adjust". The procedure most likely has to be done more than once, until everything looks ok at the same time.
I have no idea why the screen flutters when you heat the coil. I would be suspicious some other component or maybe a solder joint in the immediate vicinity.
John
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