I guess I was not clear enough on my problem. The homasote is not bulging up, it is pulling down from level. I have added 3 photos of my beam level which is showing it is currently at level. the other 2 photos show where the homasote has pulled down from level by 1/2 inch and 3/8 inch. I have only had this problem with two of the 4x8 sheets of birch plywood that is supported on a 4 foot x 4 foot basis. The beam level is sitting on the 2x12 that go across the 4 foot end of the plywood with a 2x4 running across the middle. Both problem 4x8 plywood sheets run end to end. I am going to try using 2 3 foot x 3 foot sheets of 3/4 plywood glued together pushed up under one of the 4 x 4 affected areas and see if that works. I did jack up a 4 inch x 4 inch post in the middle of the dropped area and did push it back up to level but the areas around it were still dropped. Once I get an area pushed up, it may be a wait and see if the whole area will rise. Since the whole frame of the platform is 2x12's, it has a lot of down weight to push against my pushing up. 
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