TF 998/999 parts into push button 904 ?

2.74-1.54-1.00 with "wide" splits of .562-.649. The A904 is
2.45-1.45-1.00 with "close" splits of .592-.69
Not all engines are happy about that. It doesn't look like much on paper, but with a stock lo-stall TC the engine is fine in first gear, but second, if shifted too soon, bogs down.
If that's the case , why have so many people installed A500 trans and had such good results ??? just askin .