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19mm rear bar is not a lot stiffer than the 18, although the adjustment is nice. Since you have 250 front springs, the car will be prone to very noticeable understeer, so you probably will want a somewhat dramatic increase in the rear stiffness to re-balance the car's handling.
20mm 944N/A & S M030 bar would be stiffer than the 18mm bar, but not sure its much if any more than the 968 bar on full stiff - its not adjustable either. 21mm TurboCup bars are impossible to find anymore and were big $$ even when available. So the 22mm welt adj bar is probably the best option for you.
Not ideal, as flash mentions, as you do preferably want to set the suspension balance with spring rates, but as an interim upgrade it will probably make the car feel a little more balanced at the limit.
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