"Whenever real life application came around I hadn't considered the couch being in the middle of a 60hz null so therefore the couch was moved back"
you did this by cralling around?
for ht, i think that the 22's would be fine, but if you plan on using them for music i think they would definatly not work, not enough volume.. and as far as placing 2 pair side by side, i would not do that either, get bigger speakers. also for place ment, in a HT its gona be dark so idealy you wouldnt be able to seem them very well anyway..
if you dont make the area "air tight" there is really no point in putting up a 1/2 wall.. just leave the area completly open for entertainment purposes...
good luck.
