Trading SJT along the lines you suggest, may make sense in an IRA. I say "may" because "overbought" and "top" have been uttered frequently by many knowledgeable investors and have thus far been almost consistently wrong. I did 2 successful trades of SJT about 6 months ago in my IRA, only to get out the third time and have no perceived chance to get back in. That was in the 32s. Fortunately, I also own SJT in a taxable account. There, the recapture and large gain have made me not even consider trading. Those shares I have owned all the way up. I continue to believe that a small part of SJT's rise has been due to many refusing to suffer the effect of recapture and, thus, not selling when they would have if it was another kind of stock.
Unless I have good reason to expect a sustained decline in NG prices or something SJT-specific that is highly negative (rather unlikely as to the second), I expect to hold my SJT shares for many years.