Well, LE is probably the toughest dungeons to solo before AO3 for all classes, so it's given you would fail more of less. To fail less, you should think more before acting. Even though mages are supposed to be nuke machines with little defense, you shouldn't expect pulling six mobs at once and survive. The little gorillas are especially annoying(not only that they freeze, but they do insane amounts of ranged damage and still has decent armor, much more dangerous than grownup gorillas to mages), I would think twice before charging into a pack of them even with BoM and BoV on.
And I hardly believe paladins would do much better than int build in LE+swamp due to the high armor, high damage of the mobs.