Thanks very much for all the comments and advice so far, I've read it all and appreciate it!
This month's Heroic Tank Update:
Well my phase 1 crashed and burned badly. It's the same as above (Datcha Leader, Han Solo, CLS, Qui-Gon and Ugnaught) with better gear levels than last month. However I don't know what happened as I got ripped apart. I only managed 300,000 damage before everyone was dead - including CLS.
Fortunately, the rest of the Guild got us through phase 1 without my having to use any other squads.
So this time, for phase 2, I decided to use my Resistance team for two reasons; firstly, to see how well they can do, but mostly for the second reason of there's no point hanging on to them for phase 4 if we never get there.
Rey (JT) as Leader, Rey (S), Finn, Poe, BB-8. All gear 12.
They managed 25% damage.
Another player managed roughly the same as me, I haven't heard back from him yet as to what his squad was.
If we get to phase 3, which is a distinct possibility at this stage, it will be the first time we have done so on Heroic.
I've seen the Asajj Ventress discussions and talks of how good she is for phase 2. So my plan for next month is to get her to a usable level with a decent squad behind her, and to fund a decent substitute for the Ugnaught! Maybe an anti-Droid Jawa ... ?
Anyway, just thought I might as well post monthly updates to this thread! Sorry if I bored anyone!
And thanks once again for all the feedback so far, it's appreciated!