i guess zman tefilah is a non issue.....
you are opening a can of worms which i will not get into much detail. i will say this though:
Davening at 770 has begun at 10am for the past 60+ years. This in the minyan of the Lubavitcher Rebbe Zt"l.
If it was good for him then its good for me....
(It is obviously not meant for the guy who strolls into shul at 10. Hodu begins at 10, but the hachono to daven (learning chasidus and on shabbos mevorchim saying the whole tehillim etc) begins way earlier)