Party composition matters /a lot/ in terms of how much dps you'll be able to do. I do believe with that gear and no NIN, MCH, or AST, you should be able to crest 1300+ on A5S and 1500+ on Sephirot, though.

Here is a parse I did of Seph EX with no additional buffs while using the Sephirot spear - I didn't get my Slipstream until last week.
+2 weapon damage should push that easily over 1500, likely to 1550+.

You should definitely be doing higher with your gear. By a bunch. You're likely missing optimizations in the fights. Modifying your secondary stats with sideways upgrades is not going to affect change in your actual dps output by any notable amount.