I would up their feed a bit more, if you can add in a further 200g with a third feed, not necessarily protein, but sugar beet shreds and some mix maybe. Mine get Caprivite once a week as a routine, and they will get Adam Henson drench about 6 weeks before they are due. But I wouldn't get hang up about it, lots of exercise and see if they are hungry for another feed.
Mine have got yellow rockies, and get periodically more keen on them than at other times...
But mine are fed individually in the last 6 weeks, feed goes up every week and I can see if they finish it quickly or (as happpened last year) become really fussy eaters...