Don't take the guided tour--go on your own.
My friends and I took the 7am bus from Kuching and were there by 8am. By 8:30 we'd already seen the largest orangutan and another on the first feeding platform. We were able to watch them for quite a while. And with fewer tourists (the groups hadn't arrived) it was quieter.
We saw none at the normal 9am feeding time, but it is fruiting season, so that's considered a success in terms of their rehabilitation.
We saw a mama and her baby around 10am (after feeding time) on the field and were allowed to watch them for half an hour, also. Had we taken a guided tour, we would have most likely missed this as well.