I'm not an expert! Your proportions appear to be similar to what Wilson recommends 1 ( dis. apart) to 1.1 - 1.25( dis to chair). Point the speakers at a point aprox 2'-6' behind your head as a starting place then change toe in/out to see which works best. When your close break out the level and string to make sure the tweeters are the same distance away, this is make or break for SS. Put the string from your nose to one then the other speaker (an inside or outside corner of the box which is easily duplicated on the opposite side. Use the level to make sure the tweeters are firing at points of equal heights. I would try without panel in front of TV to start. You may have already done these things but I thought it's worth a mention.
