If you think you are "missing" some spelling variants for some of your surnames, consider asking someone else how to spell them. Don't let them see the names as you read them as that's not really helpful to your purpose.
It may even best to ask a non-genealogist to do this. Otherwise they may get a little too hung up on debating it. You want off-the-cuff answers.
After all, that's probably how the census taker did it.