Dusting calcium w/ d3 every other feeding is fine combined with a multivitamin once a week. I've never come across a lobster worm, they should be fine. If you are looking for a more commonly available large earthworm; I suggest night crawlers (European, African, Canadian).

Well Reptivite D3 already has everything your pacman would need. Don't use another multivitamin on top of that (i.e. exo terra multivitamin). The nutrobal calcium I've never heard of that brand, did you pick that up at a market or shop that sold supplements and vitamins?

Dust with Reptivite D3 once a week; on a couple of night crawlers or all of the crickets you are feeding (Shake and bake method). Or if you go out again to pick up a different brand you would like I suggest: Repashy, Rep-Cal, and Flukers.