With regards to getting the height right for the plants.........think outside the box.....
..........if you can't lower the light due to different heights, hows about raising the plants on books or owt really, that way the light stays at a static height but the plants can be raised to suit their needs. If you have the light to far away the plants like you say will reach for the light and become leggy.
![Confused](https://www.growfruitandveg.co.uk/grapevine/core/images/smilies/confused.gif)
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