Your suits are fine and the new loot system makes it ludicrously easy to upgrade them further, if you're willing to use brittle (non-powderable), prized (high-insurance), cursed (non-insurable), or antique (damage quicker) pieces.
Then there's reforging, which can make really nice suit pieces.
The pit isn't all that hard as long as you have good suits and the ability to invis. Provo really helps. All you need to do is damage the other side - if you do 1-2 hits on one of the other side's (the humans, if doing Zipacriotl) spawn, for your side to gain credit for killing it when it dies. so, you wound a bunch of them (with an AoE spell or Whirlwind), then let the bugs do most of the work. The archers are the only really difficult parts.
The Zippy quest requires a mid-range T-hunter to dig the map, and the killing sea creatures part is easy (some of the creatures can be killed from just off-shore of Jhelom, or hugging the coast from Honor Shrine down to the island with Valor shrine). Green net tosses (or the dredging hooks from a quest gotten in Trinsic) han speed things up considerably.
The issues with the pit and Zippy quest involve the TIME needed to complete the parts, far more than the difficulty of the parts.