Tingling energy from the heart up only?

[Quark]

I often get tingling energy sensations running from the area of my heart at my spine up my neck, to my 3rd eye and especially strong in the crown.  Hands are a very strong area and feet sometimes as well.  Ive read about the chakra system and Im just wondering why I dont get the tingling sensations below the heart level where my lower chakras are.  

I get these sensations once or twice an hour when Im somewhat relaxed and not focused on working. Ive done some hand healing work with my girlfriend with great results.  During these sessions I seem to make a very strong connection from my crown to my hand.  Sometimes I loose feeling of my whole physical arm yet can still sense my arm.  Her legs where I usually work on can go numb with tingling sensations as well.

With all this I still dont seem to get too much happening below the heart area?  What am I doing wrong?