i used a blanket on a old setup of mine which seemed to work fine i would try to secure the blanket or whatever ur using against the wall with like tape or thumb tacks
even tho light isnt hitting the buds theyll still grow cuz the overall plant is getting light and growing still id leave the plant alone unitl the buds reach full potential
deff hps im rockin a hps right now it doesnt give off as much heat as other lights would and gets the job done from wat ive seen with my hps i wouldnt go with any other light source