Imo you could probably start 10 man TOGC, picking up some pieces towards an unblockable set would help with tanking the adds on anub'arak. for 25 man I'd say around 38khps minimum to start it. And 35k is a tad on the low side for 10 man, there are some things you can do to increase those hps:
First: keep going for epic gems, that's good.
Second: don't gem for any socket bonus that's not at least +9 stam or more. I personally will only gem for 1 socket bonus that is the most stam I can get with a red/stam gem (like +10exp/15stam or dodge/stam or agi/stam, it kinda depends on what you need. I like agi/stam for the additional armor as well as an okay amount of dodge, for you I might go with expertise/stam since your expertise is a little on the low side). However, this becomes sort of a playstyle choice at higher levels and many people will gem for any +9 or more socket bonus with like defense/stam or something. But if you're trying to meet the minimum EHP reqs, I'd say go straight stam.
Get an enchant on your weapon, I personally like blood draining. Put 225 armor to cloak, I like 18 stam for shield esp for trying to get minimum EHP reqs, also 240 armor to gloves, but 18 stam to gloves is reasonable too.
Glyphs/spec are decent.
And random question: is that the same why tempt fate that used to be on maelstrom?