bulging of print from center

[SiddharthTilala 0]

Hello!!

 

I am trying to print a rectangular block with ASA, but the part that I printed, is little bit bulged out from the center. I was using glue made from acetone and ASA itself and it successfully removes warping from the outer edge of prints but now this internal expansion or contraction is damaging center part. overall the sharpness and edges are super fine, only problem is i am getting  a little valley at center.  I hope you can understand the isssue. How can i remove bulge from print. (Assume i am printing a rectangular cube of height:  10mm, length: 160 mm and width: 160 mm).