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For dark eggs I've found that the regular little LED lights didn't cut it. Do a google search and buy a flashlight with 150 L. (lumens) or better. They drain batteries super fast, but you can find ones that take AA or AAA batteries, which are relatively inexpensive, or you can easily get rechargeable batteries in those sizes.
I found one for $20.00 that does an awesome job when I candle my BCM eggs.
I candled mine on day 4 and saw pretty much what you described but I couldnt realy tell untill day 12 when I was absolutely certain the whole egg started getting dark and I could see the chick moving back and fourth inside.