Look, the bottom line is are those numbers increasing? If you did hoist up 220 lbs in January and now, March, you're having trouble with around 151 for 3x5 (around 70 percent of January's max, I think), then I'd say, yes, you SHOULD be able to be adding more weight without any spotting as well. If you are not then there's probably a reason.
Whether your numbers for January are off here and there is not going to matter now. You intentially started at a low load. Your job is to increase what you are doing now.
And it's only been a few workouts. Give it some time.
And as far as these one rep max's, they are always changing. You can never know your maximal ability to the tee at any given time. But stop sweating it. What you did in January can't be anything more than a gauge for what you are doing now. I personally could care less, I mean, your not trying to take a trophy away from me or anything.
Perhaps you've had some setbacks. I'm sure things will look up. Just do what I said before and probably eat better.
I swear though, with all this talk about PR's it's become like the battle of the signatures around here
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P.S. Another thing that just occured to me is that you may not be warming up well enough.