ok, how are you setting up your bands, are they mini bands.
if you dont have a power rack to bench in then get two 60+ lb dumbells and set them up on the floor under the bar at about where the bar would be if it was on your chest. then take one mini band per side and just choke it on the dumbell, dont double them up. use about 135 or so and do this for 3 weeks. then you can probably use 135 and 2 chains for 3 weeks, thne do about 150-160 straight for 3 weeks. just pay attention to your bar speed. if you speed is excellent with the choked bands, then double them and still use 135. if speed is good with the chains add 10 -15 pounds of bar weight. and if speed is good with straight weight go tp 165 or so. the most important thing is to use bar speed as a guide.