Your car now has a lot of understeer, that is it wants to plow in a corner to the out side of the turn. Adding a front swaybar reduces the understeer. One that is to big will actually cause the car to go into an oversteer condition or the tendancy for the back end to spin out. Adding a rear bar tends to push the car back towards an understeer condition.
This is backwards. Adding a front bar, or increasing the stiffness of a front bar increases understeer. Adding a rear bar, or increasing the stiffness of a rear bar increases oversteer. Don't take my word for it... SCCA handling chart
My advice, get a good book (or three) on automotive suspension and handling. Don't guess at what parts to use. Just like building a good engine, the parts used must work together in order to acheive the desired results.
superdart, in your case I would get the .890 T bars and rebuild the rest of the front end. Get the best adjustable shocks you can afford. And then do some tuning and see how the car handles. If you still have too much body lean, go for the sway bars. But size them according to your oversteer/understeer requirements. Typically on a street car you want a slight amount of understeer that transitions to oversteer when more power is applied.