That voltage is probably normal where you've measured on the unswitched outlet with a 60W bulb. There is too much resistance there. It likely isn't a good sign if the bulb is anything above just a glow. Did you hear the relay click?
With a 75W, it should settle within a couple of seconds to where the filament is just barely glowing. Stop at this point if it still glowing brightly.
If all goes well there, proceed to a 100W and you should see close to line voltage on that outlet.