I have a kit as well. I didnt use it though i found an article that mentioned grinding some weight of each weight and then going for a drive. mine was just like yours and now after 3 trys it shifts into 3rd at 5k when its at wot. didnt take alot off i ll look for my notes later. i used a kitchen scale and took a little off each weight. same springs.
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72 Luxury Lemans nicely optioned 
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