I'm level 78 Ice and could use some help also. My friend, that I always quest with is also 78 Ice. We've started running into stuff we can't handle with just the two of us. We typically play in the evening and on weekends. Let us know. Have you finished Heart of the Helephant, Sylvester Gloworm and the Poseidon Earthshaker? We have those left too.
with good friends and I have finished all those dungeons you listed if you need any help i'm on most of the time