Regular Dot = 300 dmg over 6 tics to total of 1800 Damge
Tyler Dot = 900 Dmg over 2 tics to total of 1800 Damage
And everyone should be happy or not? Granted, each tic gives you the chance of a critical dot, thus removing the amount of tics loweres the chances of a critical dot. So maybe
Tylers Tuned Dot = 1180 Dmg over 2 tics to a total of 2360 Damage. (20% bonus over original spell)
Edit - then dot stacking will become an issue

Tylers retuned dot = 690 Damage over 3 tics for a total of 2070 Damage (15% bonus over original spell)