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I would argue that you don't need Deep Pockets ever, even when soloing on an Ultimate run. I can't remember ever having used more then 2 or three slots. Even if you argue you don't know what you're going to need and should best be prepared, I had scrolls of Moonwell and figurines in there - and that's it. Do you think that's class dependent? I'm about midway through an Ultimate run with a solo fighter, and I have a hard time imagining getting through some of the fights I've done without having figurines, scrolls, and potions. Although I suppose I don't have great gear at the moment, and I didn't have to do those fights as soon as I have...

A good thing to keep in mind with PoE is that while stats do matter, your equipment, your fight prep, and your buffs matter much, much more than your base stats. Make sure you're taking full advantage of rest bonuses, food, traps, etc. As far as how to build your party... I find it's helpful to think about the party in terms of tasks. Straightforward example: The typical task of your party fighter is to lock down the maximum number of enemies and hold them in place for as long as possible. Any choice you make that makes your fighter better at accomplishing that task is a good choice for that fighter, even if it doesn't maximize damage. The primary task of your rogue is to activate sneak attack as much as possible. This requires you to flank your opponents and to continuously apply conditions that will activate your sneak attack (and when you get it later, your deathblows, which require two conditions at the same time). So when you're picking abilities, ask yourself: How will this help me proc sneak attack? Also, a suggestion: Bump up your INT to make conditions last longer so you can get more out of each ability use and keep your damage up during long fights. Alternately, take the White March expansion's Persistent Distraction passive, because then you automatically apply a second condition when you move into flanking position. Your second task is to crit as much as possible. Take Dirty Fighting and Vicious Fighting to bump up your crit chance, but know that this is mostly done through equipment choices. I recommend browsing the wiki's lists of unique weapons, armor, and accessories to get a better sense of what your options are and when you can get them. Also, take Deep Wounds. I'm astonished it's not in that build's ability list. Anything that goes straight to health damage is worth taking imo. And skip Deep Pockets. You don't need Deep Pockets if you aren't soloing. Your party comp is fine -- there really isn't a wrong way to build your party in PoE. I'd swap Cipher for a summoning Chanter because I like the constant healing and the periodic meatwall/extra damage, but that's me.