Your experience matches mine in that with moving the HFT bullets to the optimal location the sound suddenly becomes focused and much more enjoyable. The FEQ does sound better plugged directly into the wall and not to the Power Plant 10 (at least the ground plane plug directly into the wall). I would try the sub woofer circuit first. My FEQ is midway between the speakers, 18 inches from the front wall and sits on the sub. Yes it works better with 3 MIG footers than 3 Herbie ISocup footers which sound better than nothing. Sounds good in 15 minutes and even better after being on for three days. Then think about fine tunning the two HFTs that are near the floor and midline- the front wall and rear wall locations.
I think you will be pleased with sound.
I think you will be pleased with sound.