A904 Lock up performance build

I need a stall to help launch the car and this one locks up pretty tight at about 1100 rpm so the car is a bit sluggish out of the hole. It would be fine for mild street driving and cruising. I am not finding anything about a stall converter that actually locks up, but I am learning as I go with this project. I have the tranny apart and the shift kit nearly completely installed but need to determine a few more mods that revolve around the lock up aspect as per my questions asked above.
Lock up converters shouldn't lock up until you are in 3rd gear. Sluggish out of the hole could be a half dozen different things not related to your transmission.