He doesn't need any more colostrum. (no matter what he thinks) 8 oz. is sufficient. Feeding regular goat's milk within 12 hours of colostrum will make the colostrum less effective for immunity.
When a newborn ruminant first ingests something, pores in the small intestine open up and catch large protein molocules that pass by. Ideally, these are the IGgs that will provide immunity to the kid until he can build up his own immune system. These pores are not selective, and will pick up any large protein,like e.coli or butterfat. The pores close after they grab a protein, and will close forever within 24 hours.
Dr Jennifer Johnson did a great study & seminars on goat colostrum and ruminant colostrum fuction. I was lucky to attend her presentations
As far as the first dose of CD-tet- you can use the UC-Davis protocol of 3, 6, 9 & 12 weeks. This protocol was developed by Dr. Joan Rowe,who is also a prominent Togg breeder & ADGA judge.
Personally, I do a CD/Tet at 6 weeks and the next one two months from kidding. I know a breeder who vaccinates his entire herd monthly. So there is a wide range of successful CD/Tet programs among various breeders.