How far along are your plants ? When I know that space (heighth) is going to be an issue, I start pinching every fourth node as it grows. This will send to branches out from each pinch (of the growing spurt on top). If you do this every fourth node (branch) as it grows, you'll have a nice bush. Growing outside, that translates to more buds. Inside, it depends on the conditions (nutes, light, etc...).