Thanks for the hard work! After flashing v2.2.6 from my stock GB 2.3.3 (and trying out all the different updates) I thought I need search no more and the perfect rom for x10 is here.
But now that I've installed v2.2.7_Test it's even better! Excellent performance. I am also glad to report that I flashed "XperiaS_build_custom_Donut/ICS" update and also flashed stock XperiaS Phonebook, MMS and Home (as I prefer the looks better) and its all working fine for last two days. No errors whatsoever.