Jack, some guys are just made to wear a shaved head, and you are one of them! That baldie haircut looks awesome. I'm glad you are liking it.
There always seems to be a couple spots that don't get perfectly smooth. If I want a super smooth head, I wait 2 or 3 days to shave, plenty of hot water, and a fresh razor. That's hard because I like to shave everyday.
I just use Dial Coconut water bar soap. It's very slippery. Although they're not as good as they used to be, I use a Schick Extreme 3 disposable razor. They are slightly curved, so work good on the head. Sometimes I use my double edge safety razor with an Astra blade.
Good luck, and wear that smooth some proudly!