When it comes to rogues I think horc is overrated. You NEED to go max STR cause otherwise there is no point creating a horc rogue, unless u don't take PA enhancements. But then again, why would u not take it as it's 2nd best enhancement line horcs have.
Max dps = human/helf. Human probably better cause of extra feat and helf dillies ain't that great and cost some APs. End of story.
I've been always wondering why people put redscale armors on their rogues, apart from the obvious *bling bling*. I know, 2 slots, sup fire res, incineration - nothing spectacular (with all that epic gear you'll have more than enough slots to augment w/e you want and i wouldn't pay any attention to guards unless you are tanking). I'd rather have the ease of swapping DT armors in an instant than to be tied to only one armor. There are just so many good choices to customise them: heal amp/GFL/heavy fort/resistance +5/some guards/tharnes, depending on your other gear.
Another thing is Nyoko set, if u have Tharnes or any other Backstabbing item this set gives u only 20% less threat and takes 2 very important slots. Kyosho/Veriks sets are much much better than this one or epic stalker ring + some necklace.
About threat, if u pug a lot it would be better for u to have as much reduction as u can get. But if you are going to run mainly with guild/friends and have threat reducing items, not to mention improved diplo and bluff, i don't see a need to max SB. When i go all-out on my decked out assassin (tharne's set + SB III = 44%) i usually hit bluff, damage + haste boosts and diplo once off timer. I rarely grab aggro that way, granted they upped fort greatly and i don't pug many raids nowadays.
Now HPs, i guess those 580hp is your max possible without significantly gimping your DPS.You'd be better off dropping one/two abishai pieces and getting gs hp item instead. DDO pot? Meh. Yugo pot? That shouldn't even be in a thread about "MAX DPS". Not having Toughness or GS hp item really hurts (it's almost 90hp combined). With the changes to bosses' fort and hps u need more hp yourself as healers won't spam heals and chug sp pots for you.
Edit: @ Qezuzu While it's not an issue on 0-50% fort mobs and raid bosses, it really becomes one while fighting 80-100% ones like Lailat, LoB, Abbot who happen to have decent-high AC. High fort and high AC -> less SA -> more regular attacks -> less to-hit -> more misses -> less DPS.