Don't worry about the stretch Sativa, this is completly normal, even in your case. The plant will stop very soon. Once that main strtech is done, all the plant will do is bud now filling up those stretched out budsites.

Don't fret man, they look good! Completly normal. I've had some plants more than triple their height before, but yours are shwoing some main bud on top now. That is a good sign that the main strtech is done, and now the calyxs will start forming and swelling...creating buds.

Peace