Do this!
(you know you want to)
Although, Fight Kiln definitely is much easier than the Fight Caves.
The thing that made Jad annoying, to me, was that you had to pay attention to the healers, which meant you were much more likely to miss a prayer switch.
In the kiln, you're 1v1 with Jad (apart from the double Jad wave), so you can pay full attention to Jad's attack and change prayer accordingly.
And besides, TzTok-Jad = 40k LP, while TokHaar-Jad have only 7900 LP. You can pretty much 4-hit every Jad in the Fight Kiln, they'll be dead before you can even realize they're dead.
There's the double Jad wave, but you can easily safespot one of the two so that you only have one of them on you (not to mention the invulnerability crystals.)
For comparison's sake:
TzTok-Jad: Has the potential to 1HKO you if you misclick/lag/get distracted
Har-Aken: Walk in the park, the tentacles (and the head) do barely any damage and, chances are, you will still have at least one invulnerability crystal when you reach Har-Aken if you feel like using it there.