Mid-game help needed

[Kalenden]

I've gotten to the midgame (Verona island,) and I'm having a bit of a problem. All remaining enemies are either strong to lethal, making it difficult to defeat them without a lot of losses.

I'm a lvl 20 paladin , playing on normal with 6500 leadership (+-), 50+-rage and 30 mana. my army composition is as follows:

Royal Thorns
Paladins
Inquisitors
Rune Mages
Red Dragons

I've gotten 3 Order magic and 2 in the other one (not chaos, forgot the name). Also 1 in Resurrection, and I'm working on bringing that skill to 3.
Basic strategy is to use the Red Dragons to tank, giving them stone skin and healing, making the rune mages/royal thorns summon up other units to help my main tank and using the rest of the units to resurrect any losses.

However, other heroes rape me with spells ( mostly because they are Lethal ) and non heroes are at very strong/lethal. The next island (the one with all the orcs) is also way over my level.
Any suggestions?