Suggestions for custom matrix for high bitrate

[markrb]

I am currently using Megui with x264 and the standard matrix.
I am using it to convert my Hi-def Blu-Ray and HD-DVD material so my HTPC software can use it with it's internal player (more then size reduction).
For speed I am encoding at 720P. Also at 12'-14' I can't tell the difference between 1080 and 720 on my 55" TV.
I get file sizes from 8gb-12gb with either the DTS or AC3 audio.
Bitrate is often around 11k-12k average.

Based on these settings is there any other Matrix I should try?

Thanks,
Mark

[Dark Shikari]

For x264, you don't use a custom matrix because you're encoding at X bitrate, in my experience; you use one because you want, for example, greater grain retention.

Is there anything in particular you want the matrix to get you?

[markrb]

No not really anything specific.
Just hunting for ways to get more (if I can) out of my encodes.
Awhile back there were a bunch of matrixes floating around, but I haven't seen much in some time on this subject.

Mark