I use four tea bags (all mixed together) to brew two consecutive coffeepot-fulls of herbal tea. I'd say in all, I make just short of a gallon of herbal tea with the four tea bags--obviously the first pot is stronger than the second. I drink about 3/4 of it, my wife has the other 1/4. My wife also drinks her share out of the second, weaker brew--I like that because she is pregnant, so there is even less chance of her overdoing any one herb.
This morning, since I've been a bit more stressed lately, I brewed up 2 bags of chamomile and 2 bags of TJ's Mint Melange.
Your mix sounds just fine, it wouldn't be that much "weaker" than mine.