After 23 plus year in the airforce I can add my 2 cents also. The J-57 on the B-52 was the same engine as used on the KC-135. On the buff you turned it 100%, and the engine pressure ratio was reflecting that. We never ever lost an engine on takeoff. On the KC the engine was pushed to about 104%, epr reflecting the added boost, and I can remember several times we shelled an engine on take off roll. The guys that design and test these things usually know what they are doing. If you want more power, just get a more powerful engine. It lives longer, costs less, and you will have a plane that will be around longer. Just my two cents worth. Oh, on the B-58 normal takeoff was 100% with burner. You could go into overspeed and push it to 103%, but it better be for a good reason.