That does seem quite a few wrong, we wouldn't usually have three wrong in round about 1000. Last year we only had one wrong, scanned as a twin which was triplets, but she was a sheep who was tupped three weeks earlier but scanned with everything else, so I did know there was a chance of that.
Pleased your lambs are good, small at birth isn't a problem as long as they get up, feed, and grow, and your condition scores sound right, I don't like to complain about the work of someone who isn't there to answer for themselves, but I would maybe see if there is someone different you could try next time.