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If you want the RPMs to go down you are actually upshifting, downshifting would be going into a lower gear with more RPMs. Did you reconnect your bowden cable? That seems like it has the most effect on shift timing, the vacuum modulator is more so how hard or soft not so much when.
There is an adjustment for the throttle linkage as the rod comes through the firewall. Have an assistant or wedge something on your accelerator to see if it does actually go all the way, if not you should be able to adjust it out with the bolt by the firewall or worst case pop one of the ends off and make the linkage longer.
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