So @crispymorgan, @Misneach_, @Stretch616 and myself had a number of games last night and here's some of the takeaway from it.
Sleeper
We had a great little debate online as to whether or not it breaks Gambit. I'm on the fence on this as its early doors and we haven't learned it all. I can definitely agree however something needs tweaking as it can be a game decider more often than not due to the damage output on the boss and OHK on the other team. Nerfing it is out of the question. It is an exotic, it should feel OP. Either other guns get buffed or/and do something to highlight a sleeper is on the playing field. They have strong evidence buffing other stuff to keep up is the right way to go. Equally many others have found ways to win without it.
Banking and Mote Collection
@Stretch616 decided to focus solely on killing ads. Then simple comms between us 3 to leave specific motes on the ground worked well. The onus is on the mote collector saying "need one more". Then others can call out they've left some.
Invading
Sticking to one main invader and a deputy works really well. Defined roles that takes seconds before a match just calms down your play. I was main invader but then when i was low on heavy ammo and no super I'd call out to @crispymorgan to take his super over to the other side. Also, timing when to use the portal should only really be used when the opposition are holding motes that haven't been banked. Going in straight after a blocker also helps as you know they are distracted.
Teamwork
Stick to the task at hand and don't be overthrown by emotion. We won some games comfortably but once we had a a better team it can throw your judgement. We had a few calls of "sod it, I'm going over to get that guy". That's when things can start to fall apart. Not always but alot of the time it does because your team structure is all over the place then.
Primeval
Focus on ads first. They will protect and slow down DPS on Primeval. Stack supers and heavy for this stage. Its a race against and can become hectic! If an invader comes in, unless you are just about to kill it, all of you should have a quick check for the Invader. Its essential so you minimise deaths.
Ultimately its a great gamemode that will be thoroughly rewarding when you win and at times frustrsting to lose games that flip the other way so late in the game. More to learn I'm sure and hope this helps some of you.