Ergonomics are a huge factor in playing the drums, I've rearranged my kit so many times to get everything right. You never want to be reaching for anything or leaning to reach something, keep it all close to you. My remedy for being shorter is I also use longer sticks to reach everything without leaning.
Throne height is another big thing to out watch for, a 1/2" difference can make a world of difference in your energy spent and how you sit. If you notice that you're having balance issues when playing make sure you're not sitting too high or low. I play tons of double kick and developing the slower speed doubles requires a very solid base, so I'm very fussy with my throne.
I make a conscious effort to keep my back very straight and head up when I'm playing. I've been working on it ever since I noticed Buddy Rich and Niel Peart both have quite a shoulder hunch from leaning over on the kit.