Convertor gurus enter

I had a Hughes 10" 3K behind the 416 and it seemed to flash right around there. To get it moving it only needed about 1500-2000 rpm. Cruising around it seemed to hang around 2500 rpm. 4200 seems kinda high for a 3500 converter to me. I've heard mixed opinions about Hughes converters. That's why I sold mine and got a Dynamic.