I think others can give you better advice than I can with a veiled, as I haven't owned one. I do have a panther, and when he was a little guy, my supplementation schedule was something like this...
Minerall I one day a week
RepCal with D3 three days a week
RepCal without D3 2 days a week
One day with nothing at all.
I never dusted with all three.. and I didn't use herptivite until he was much older, but that is simply because.. well, I didn't.
There are A LOT of knowledgable veiled breeders and keepers on this forum, and I am sure they will pop in with more information for you.
The good thing is that you are supplementing! Lots miss that all together! Are you gutloading your crickets? And, are you feeding him anything besides crickets?
Heika