Hi Kinger, if you were working with one of our designers (me or one of the other guys) I'd get back in touch with them for followup suggestions. They will already have the details about your room & setup which is essential to giving you the most intelligent advice we can.
Apart from that I have a few ideas/suggestions.
First, yes I would keep dialing in the speaker placement. Apart from good imaging, the distance between the back of your speakers and the front wall behind them will have an effect on the bass response, usually appearing as a null in the bass region (often between about 75Hz and 150Hz or so). Moving the speakers closer to and further from the wall will affect this null, so you can test it for yourself (crudely with an RTA device or phone app, more comprehensively with something like REW). Typically best results come either with the speakers right up on the front wall, as close as you can get without touching, OR at least 3-4' away (which isn't usually practical in small rooms). If the speakers are right up on the front wall it's usually better to NOT have a panel behind the speaker, and instead just move the speaker that much closer to the wall, with the panels placed beside the speakers.
Next, make sure you are using panels at the reflection points on the side walls & ceiling. The number of panels in each location can vary depending on the specifics, but I'd be inclined to use 2 244s per side wall, and the 3 242s on the ceiling, for a "cloud" between the speakers and the listening spot. The remaining 244s can go in the corners for now, then if you decide to upgrade the corner bass traps down the road you can repurpose the 244s elsewhere in the room (244s are still GIK's most versatile and cost-effective product).
On another note, 11 panels are nowhere near too much treatment. My room is a small 10x12 bedroom, and I have 6 Soffit bass traps (range limited), 12 Monsters (full range absorption), and 4 Alpha 6As (hybrid absorber/bass trap/diffusors). It sounds wonderful in here, the best small room I've seen (test data) or heard in person. The key is balance, ie, having the right treatments in the right roles. As long as you maintain good balance, and not overdo high frequency absorption with not enough bass trapping or diffusion, then the more panels in the room the better it will sound.
Lastly, giving your ears time to adapt to new setups/treatments is essential. The psychoacoustics of this are complex and very interesting, but we tend to hear anything "new" as "bad" because it's not what we're used to hearing. But as we give it time and listen more, we often start to realize that, hey, things are actually more accurate here, I can pinpoint the location of each instrument in the mix, the bass response is much more accurate, etc. This article on my blog
explores this phenomenon.
Good luck with the new setup!