i think you can do better than your current setting.
As you said previously, your rams are XMS2 right? im sure it would perform better, my corsair value select is able to run @ 380mhz with exact timing as yours @ 2.1 vdimm.

And i would also suggest to increase your HT to 4, 750 is a very small bandwidth, quite alot of performance is sacrificed with 7xx HT frequency. With your current fsb, 250Mhzx4 is 1000mhz, which is the perfect spot for your HT link.