1984 300CD, automatic, US

I recently replaced the manifold gasket and while I had the turbo off, I rebuilt it. The turbo wasn't in bad shape inside. The intake manifold was so loose you could wiggle it. Somehow it measured 5 lbs of boost under load. Now, it's much quieter and tight. It now measures 8 lbs of boost which is noticeably better. But, I can't really feel an improvement in power while accelerating. One problem is the my kickdown switch isn't working. But, even manually downshifting it isn't noticeably better. What could improve acceleration?