Just a suggestion.. Gets some chicken wire and 4- 10foot pieces of Rebar.. drive the rebar around the plant and top the plants higher tops ... Place the chicken wire over the plant a bit lower than the top and GENTALLY bend the branches to stay under the wire.

This is called scrog and is generally done early but works fine to keep the buds low as they fill out ..

Heres a pic of my outdoor scrog grow and the ideas the same for you only your starting a bit late so ya gota have more hight..

http://gallery.cannabis.com/data/500/medium/scrog1.jpg

"Grow Forth and Prosper"..... Vulcan Grower...