Drowzy,
This question isn't so easily answered as we'd like. Yes, Gemini and Sag on the Asc are often associated with increased height over average - relative to the parents. Yes, Jupiter is definitely associated with increased size and height. Even though planets conjunct or parallel the Asc take precedence, a planet can and does have effect on the Asc remotely, even if it is not in the 1st house. My work in rectification and validation of charts using secondary progressions shows that a planet in tight conjunction or parallel to the 12th cusp, for example, still is aspecting and affecting the 6th house cusp and often accompanies events relating to bodily health, habits, pets, vocation, etc. This is true even if the planet is moving through the 9th. (This recently happened to me).
The problem here is you're working with an inaccurate chart. There were no possible Ascendants in early-mid Leo for your date/location of birth. The only way you can be Leo rising is if the birth time is a typo recorded as one hour earlier than it should have been. The only possible Asc in Leo there/then was at 29LEO14 - give or take a few minutes of arc.
There are possible Ascendants in Cancer at about 1 and 14*. There is one possibility at 12* Gemini.
Read their descriptions to see which one fits you best:
http://www.astrologyweekly.com/forum/showthread.php?t=25131