Is that 3000 RPM based on "maximum performance" recommendation?
What are your cam specs, tire size and axle gearing?
Running a stock 4R70W convertor is in the low to mid 2000 range. But being a stock convertor it still had good driving force even at idle. Only when you got on it does it flare up. It is also a lockup convertor so you are not boiling the fluid at low speeds. Lockup convertors are much more forgiving of higher stall speeds, so long as you can run them locked up.