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A picture is worth 1K words on what the set is actually doing.
Unless the tuner and or IF are fubar it's usually easier to use the tuner and an RF modulator/transmitter especially as your collection grows. Injection can cause problems (and should be saved for hopeless cases)...retrace lines aren't typically from overdriving the injection point (that usually results in a overly contrasty picture), but more common from under driving the injection point and cranking the gain (contrast) and brightness to compensate.
This is something you get a handle on with working RF when adjusting AGC in a set since AGC is basically a to set/regulate a signal level at the detector
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