I do the same. For me the arched MSH just makes the 1911 point more glock like than the flat one. It also has the hump in it more similar to a glock. I shot glocks for a while then had trouble switching back to the 1911s. Put the arched MSH in the gun and it just felt better for me at least. I say give it a try they are cheap. I personally like the Colt, polymer MSH to keep the weight down with the techwell magwell. Midway has them cheap so worth trying it out.
http://www.midwayusa.com/viewProduct/default.aspx?productNumber=280054