I'm going to have to phrase this carefully not to sound like everyone on HF... but here goes.
You might not be getting everything out of those MG 1.6s
I really strongly believe they need more room to reach their full potential than you are giving them. That is certainly not to say that they don't sound good, but they might be able to sound better.
Most important is distance from sidewalls, in my opinion, with distance from listening position falling after that.
Just something to consider. They're still a great bargain, and they scale awfully well.