The enemies around a camp are usually at that camp's level range, so I'd go looking in the general vicinity of camp Tranquil if those are the current leves you are doing.

On guildleve difficulty, don't be afraid to go back and do the lower rank leves even if you have higher ranks available. If you can set the older ones at a high difficulty and complete them quickly to get the time bonus they might be more SP than the higher rank ones and a lot less of a headache. Don't forget about all your buffs before you engage, Protect + Shell + Stoneskin + Shock Spikes gives you a good amount of breathing room. If you work on Thaumaturge a little bit you can also pick up Sacrifice which gives you a nice Regen effect.