Arkena has much more guidance to give you than I can, but I will put input here for your base suit. You should remain in your Amarr Logi suit for the entire match for two reasons.

1. Your bonus is tied to that logistics suit. Switching to another Amarr suit will not maintain that bonus (this may change if CCP ever gets back to us on how they were intended to work, but as it is today, switching out removes your bonus)

2. If you're in PC, you're in one role. ONE. If you're a heavy, that's all you are, a heavy body to fill a doorway, soak up bullets and get'sum. If you're an uplink logi, that's all you concentrate on.

You're not to be a jack of all trades (that's great for pubs). In PC, they picked you for a very specific skill and that skill is what they need out of you. If I were brought in to be the uplink party, my job is to lay uplinks in strategic locations, not die and always keep an eye on them. Because uplinks are vital, my uplinks are going to go down (either from use or from getting taken out by the enemy). Therefore, my job is not to engage, though it might be to defend a very critical spawn point for a given map, but to lay them down and not die. Period.

My team doesn't care if that one redberry is alone and I could shoot him from the rooftop. There are 5 other guys down there to take care of him with a logi to heal and revive if needed. I'm doing a disservice calling attention to myself on the roof/around a corner/etc where other uplinks might be. Great way to get an orbie called on you or even a dropship called in just for you to put your whole team at a disadvantage. The only time I change loadouts or stop uplinking is if SL says to. No rambo.

This man also has good advice. Listen to him.

Don't worry about branching out. That's only a concern when you're at 20-30M+ SP with maxed cores and you've maxed your first role.

If you only have basic armour repairers, don't bother. Just plate it instead.

It only really becomes worth it over a plate (and then, only once) at complex.

I would wait on that repairer then. Like stated before, when you depend on LP gear, unless you can hoard a LOT of that one item, it can get you in a super hairy mess. I have a crap ton of logi suits for each situation. Scrolling through that is really not efficient. If you happen to die and/or run out of a specific item, you can't really spare the time to restock that suit in the middle of a fight where every single precious second counts.

Protip. Before a PC battle, put a 'A_' in front of the suits you will be using in a PC match. It will put it at the very top of your feed, so no scrolling. You shouldn't have to choose between more than 2 suits, 3 at max. If you must use LP items, make it only one of the 3 with a backup equivalent of it not LP. That means if you chose to rock a suit with an LP complex hardener and run out, have a back up suit of the exact same type with that repairer replaced with a plate.

Then go for the complex shield extenders instead.