Finally decided on what to do with the round-up, and started the main tests today.

Here are some findings for this kit:

Mainboard: Asus P5K3 Deluxe ( BIOS 0810 )

Tightest stable timings for DDR3-1800 1.8V ( Stock Main Timings & Freq ):
[ in BIOS order ]
1T Command Rate
8-7-6-21-1-48-4-4-1-E-D-E(0)

Tightest stable timings for max 5-5-4-15 tests @ 2.25V & DDR3-1535:
[ in BIOS Order ]
1T Command Rate
5-5-4-15-1-36-3-4-1-E-D-E(0)