I wouldn't touch the are in front of the lug after you've already bedded it. There is a risk that some bedding material seeps between your existing bedding and the receiver, essentially ruining the fit. You got the part that really matters, wich is from behind the lug, so atleast try it before trying to touch it up or redoing it.
That bed may not be the prettiest one ever made but it should work better than no bedding at all imo. Nice work for a first.
From what I've learnt doing bedding jobs at work it is not worth to cheap out on the amount of bedding compound. Using plenty of it the extra will squeeze out and the bed will look cleaner and make contact everywhere. Devcon handles the bigger fills without any issues from what I've seen.
Protect the stock and voids on the action carefully, inlet generously to give enough thickness for your compound and use a lot of it when you go at it next time

Wax based release agents seem to be the most reliable. I like the kiwi shoe polish, as does many other smiths aswell.