ewww, lifting from your heels will get your seoi-nage reversed in a second. You have better stability and forward throwing force if you keep the weight forward. (ok, my squating technique is for Judo training, but you never know when you may need to throw somebody! always be prepared!)
And the pointing knees too far outward thing was just a guess as to why he may have a groin injury from squats. Toes (and knees with them) should be slightly outward, I'd say no more than 30 degrees-ish.