unless u can bend those babies i think your gonna be screwed on those tops id say chop em and focus on budding the mid shoots so u have room to go up more if you are halfway into flowering already u might be ok if u have a bit more verticle room there plants can double or more their height during the flowering photoperiod nextime around get an indica variety and flower them when they reach about a foot of height
well thats my 2cents
kilo