Have you tried disconnecting the kick down cable at the throttle spool to see if that affects any change in the shift points?
I installed a transmission from a b234f car as a replacement in a b230f car only to find it was equipped with a different kick down cable. The transmission was fine but would shift way too soon and the cable length prevented it from being adjusted enough to remedy the problem.
While I believe that the kick down cable from the b230ft transmission should work on your b230f car it would be easy enough to disconnect it and see if the additional slack offers different shift points.
Randy
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Any twenty minute job is just a broken bolt away from a three day ordeal
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