Mind push is short range and it's hard to mind push even a warrior who keeps moving well (still it doesn't mean it's a waste of trying to use it). Fights against marksman in close range are reallly rare. Marksman has Winter Stroke and Ambush to prevent a mage from getting close.
MARKSMAN.Now I assume mage is buffed as well as marksman is buffed (Strategic Pos, Acrobatic, maybe something else). Marks using piggybacking of course (timing is crucial). Normall hit (~350), DS -> Normal hit (~500), Arcana Strike (~1k) -> Normal hit (~500), Serpent Bite (100/s) -> Normal hit (~500), Winter Strike*(~700) (or possibly Ignus Scorch). Enough. If not Arcana Strike again. Could be worth using Burst of Wind before SM conju puts Steel Skin (would make some normal hits deal decent dmg).
When marks is buffed SM mage deal 60% less normal dmg with all hits. Also would be much easier if marksman have Distracting Shot, but I understand it may be hard to obtain. This is only an outline of tactic, so please treat it as such.
About
WARLOCKS. First I must say I (SM conju) really rarely can win 1 on 1 vs casting warlock. Sultar gives him enough time to use any spells to prevent me from dealing any damage. The only method is to dizzy such a warlock. Also Wind Wall is a great defensive spell. Elemental Exposure makes all elemental skills dealing lot more dmg.
In lock caster vs SM lock the chances are 50/50 I think. The one who first lock (sultar, dizzy or something like this) another warlock should win.
HUNTER should take advantage of their Camo and Distracting Shot and Ambush. Though they should run away if SM conju will have time to cast Steel Skin. Tear Apart and Break Apart could be useful here too. Just no point in dealing 40-60 dmg per shot.
KNIGHT. Lots of hp, blocking, decent armor. Only Mind Push can hold them back for longer time. Big possibility that SM buffs wear off when fighting him. This is a chance for a knight to get the SM mage when he's recasting them. Successful Mind Squasher renders SM mage unable to deal bigger amounts of damage. On the other side Mana Borrow can prevent him from using any skills quite easily (but not every SM mage have points to get this skill to a nice lvl).
BARB. Many barbs forget to use Caution. Only Onslaught an go. It's a bad tactic. Ons cancels some -% movement speed from Mind Push. Same thing with Mana Borrow. Barb is the weakest cos he may not have a chance to reach the SM mage.
When any warrior reaches SM mage he should do everything to prevent him from attacking. Feint, Kick - those may be worth using them on higher lvl than 1. Mostly warrior can kill SM mage with normal hits. Try to cancel SS with MS.
Those are only examples. There are plenty of tactics against SM mage. Using them could be sometimes tricky, but (sigh) this is Regnum - the tactic and teamplay game
. Make use of it.