When i got my foals 2 weeks ago they had been weaned on ewe nuts

.And because i have to order my feed at the feed merchants i ordered a bag of D&H build up and basic pony nuts just to get me through the first couple of weeks.They are both eating it well with a handful of chaff to bulk it out and both out in the day in a small turnout paddock (about 20x60) for excercise really not much grazing, but i do put a full haynet out for them as the grazing isn't much at this time of year and large haynet each on a nightime.
The colt is in good condition but the filly is bum high and needs to put a bit more condition on really she doesn't seem to eat as much as the colt (haywise)
I have wrote to Baileys and they suggested using there stud mix/cubes and stud balancer and they supplied me with a feeding chart, it just seems the ammounts seem a bit extravagent to me.
Has anyone any advice for feeding native weanlings before i order from the feed merchants.
What do you feed your weanlings for the first 6 months after weaning? brands and ammounts please.
Any Advice would be most welcome