my puppy bites a lott!!!!!

Question
hey i have a labrador puppy which is about 6weeks old.He's perfectly healthy(touch wood!) and playful as well.His vaccinations are due in a day or two.My vet when she examined his behaviour said he would have to be an alpha male has he exhibited a lotta signs of those shown by alpha dogs.The most important and the latest one also being that he was seen humping on a couple of occasions on a pillow kept on the floor for the puppy. He really bites us a lot and i have provided him as of now with about six to eight chew toys as well..but everytime i even replace my hand woth a chew toy he drops the chew toy and comes lunging back for my hand (or leg or any part of my body).I have tried different techniques with him like reprimandng him in a firm and stern voice by saying "NO" whenever he bites me,and also catching him by the cruff of his neck the same way his mother would and repeating "NO". All this hadn't helped and now we just read in a book that yelping when he bites and then ignoring him after he's done that will help him inderstand that he's actually hurt one of his pack members and also not giving him any attention would make him come back to us and ask for attention thus enabling him to understand that biting us is not a great way out.But i am really disappointed with the outcome of this as well...he just does not seem to be bothered even if we walk away.He comes back running to bite usand just does not listen even if we pick him up when he does that.
Someone also suggested gently slapping under his jaw and repeating a "NO" so that he associates that with a bad act.But none of this has helped.Moreover his jaws are really strong and his bite is razor sharp...so none of his bites are ctually tolerable for any of us.They actually leave really red and deep puncture marks after he bites us.
Please please please help me out on this one...Also this thing of the alpha dog is really bothering me. He does things as per his own will and even after repeated commands for him to change there doesnt seem to be any improvement worth talking of.NOt once has he ever licked us when excited,all he has done so far is bite us.Whether it's the face, the hands,the legs wherever,he's not licked us even once.He also does not wag his tail too often when he sees us. My friend has a labrador puppy of around the same age but his puppy actually come running when called and llistens to all his commands. It's also very loving and affectionate and vigorously wags it's tail ad licks him when he comes home.Can i never expect my puppy to do the same ever???Wob't he be as expressive and affectionate as this other pup?Aren't alpha dogs affectionate at all??
pls pls pls help me out n this one...this guy has an excellent lineage (father english and mother australian) and is perfect if not for this small problem.Pls temme how should i handle him and train him to listen to me.
thanks a lot in advance.
-n.

Answer
Your dog will be affectionate to you as soon as you teach him where he belongs in the family. you can do that with 3 steps. 1) If you open a cupboard and he squeezes himself in to see what is going on, you need to push him away. 2) Do not allow him to sit on your couch or bed, if he is sitting on something that is not the ground, you will have to pick him up and put him back on the ground. and 3) when he bites you, you have to close his mouth by holding his muzzle tight with both your hands and not let go untill he starts to whine.
Good luck...