Okay, I think you need to practice on the Human fights in both of your saves first.
Believe me, you won't believe how much easier they are to do than the Elven stacks.
You may find that with both Elves and Humans placing both Vamps in your leftmost slot will work the best for you.
Doing this ensures that the Werewolves by the Fauns move to the their right (your left). For the Humans, it won't matter as the Guardsmen will go down one path and the Swordsmen the other.
You actually can stay in Vampire form for both Human fights until the melee troops are basically right on you. It is very important that the Priests do not Heal and kill both of your Vamps. Losing one is okay - don't sweat it, it's easy to regenerate on the Guardsmen / Swordsmen later.
For the Humans, cast the first Level 2 Kamikaze on the Priests and then the second on the Bowmen. Then use Poison Skull / Frost Grasp Level 2 on the Inquisitors.
By the time the melee troops are upon you, careful waiting, moving to escape, and then being second (after the Inquisitors) will allow to escape in Vampire form and then the Priests and Bowmen should be dead by the time you need to transform to Bats with just the melee troops and maybe an Inquisitor or two left. Finish them off with a Level 1 damaging spell and then BatCycle the melee troops saving up to cast a Level 2 Kamikaze on them to make the BatCycle go faster.
Practice on that Human squad until it is easy (do both in both games so you get good practice).
For the other game with the Sprites, believe me, this is easier than the Lake Fairies as the extra Werewolves are mostly irrelevant (so long as you don't forget that you can't use your Vamps to kill them). You do have 9 Elves, so only worry about getting them Diverted (I guess if you Divert both the Elves and the Fauns, that is a bonus).
Position your Vamps in the leftmost spot so that the Sprites and Werewolves go the right (your left) path. You need to cast at least 2 Kamikazes on the Sprites and Werewolves (that are closest). You'll eventually work your way away from them on the right side, switching to Bats to escape. On round 3 you'll have to work on the Elves with Poison Skull Level 2, but be sure to save enough Mana to cast another Kamikaze on the last stack of Werewolves (if you can cast a third Kamikaze on them on round 3 instead of Poison Skulling the Elves do it, but you'll just have to see how it goes).
What makes both of these fights difficult is that the 9 Elves can Double Shot kill (barely) one of your Vamps on round one. If the above does not work, you'll have to Poison Skull the 9 Elves on round one so that they do not kill a Vamp on round two. But, this delays your Kamikaze's, although this worked for me with the Lake Fairies.
Sequence is everything for these fights as well as subtle positioning of your Vamps to get units to use more action points, you may have to experiment with who you put the Kamikaze on first. As a note, there are situations where Kamikaze will make troops skip their turn. Something to do with casting it on a higher initiative troop, so you may find that you need to do this thereby causing lower initiative troops (maybe just one) to skip their turn, but be careful because more likely than not, it causes troops to separate when you want them bunched up for that kaboom! I've seen this happen a lot, especially in the Basement when I'm trying to defeat those guys.
Good luck, maybe I'll try the other Kamikaze game later...
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