First off I agree with Booche, unless the target has a suitable backstop up is never good with a rifle.
I think you have two problems. First off you zero on sand bags then shoot off a bipod. (If you change the recipe you change the taste.) Always do a finale zero check under real shooting conditions. A bipod can affect the harmonics of a barrel, depending upon how it mounts to the gun. This will possibly shift the zero. Next and the most likely culprit is the zero distance. 35 yards is too close. I would back out to 65 yards and then test it at 35 and 90 yards. I would say that you shot over the target. Angles, unless very steep, have no where the effect on trajectory that most think, but can compound and existing problem. Hope this helps.