Blocking my work

Since I finished my Sonja rug, I have been working hard at getting it blocked.  This one I found hard to block as it went slightly out of kilter when I removed the thumb tacks after four weeks of blocking.  All of the edges were perfectly straight but, instead of a perfect rectangle, it skewed slightly to become a parallelogram.  Very frustrating! 
I eventually figured out that my iron wasn't steaming the piece well enough and I bought a small, hand-held steamer.  I have now re-blocked the rug and steamed it several times to get the piece perfect and am letting it dry really well before I remove it from the blocking board.  My fingers are crossed that the rug will hold its shape this time.  Hopefully, my next picture of this rug will be of the completed piece!