Who do you use for custom torque converter?

I have just went through this bs with custom made torque converters.If there is a company
that builds a torque converter that has a way to test the converter to give you the correct stall you want buy it if it costs you 300 dollars more.Because 9 times out of ten they will not get it right and you on your on time will be taking it out and sending it back to redo it which will cost you more money.