Why You Shouldn't Use Fracture

[Sapphidia]

There's no way 60 and 72 can be correct before bottoming out. That's almost close to literally spamming fracture.

As we've said, a non-fracture rotation (BB BB SE) is 64.4 TP per GCD, a net loss of 14.4. The average potency of a GCD is 196.7. It does 3.05 damage per TP.
A fracture rotation puts in 1 fracture every 4 triple-hit-combos, and works out at 65.6 TP per GCD, a net loss of 15.6. Average potency per attack is 204.6. It does 3.12 damage per TP on average.

Just from the above calculations you can see that the damage per TP is higher with fracture inserted. The ratio of 14.4 to 15.6 is 0.92. The ratio of 60 to 72 is 0.83. It's 64 and 69 as coramac says.

Non-fracture rotation will never, ever catch up in damage done over any time period. Taking that 69 GCDs...

After 69 global cooldowns, the point at which non-fracture hits zero, it has done 69x196.7 potency. That's 13,572 potency of damage. After this point it generates 50x3.05 damage every GCD (152.5 per gcd)
After 64 global cooldowns, the fracture rotation has done 64x204.6 (13094) potency and then hits zero TP. It then has five globals where it generates 250 TP. 250x3.12 is 780 potency over 5 GCDs, which is 156 potency per GCD.

So after 69 global cooldowns, both rotations are then running on the .77/.78 damage calc. The non-fracture has done 13,572 potency, the fracture has done (13,094+780) = 13,874.4 potency. Which is about 3% more. After this point, non-fracture will never catch up as it can only muster 152.5 damage per global cooldown whereas Fracture rotation can manage 156.

TLDR - Including 1 fracture every 30 seconds is ALWAYS going to increase your DPS by around 3% regardless of when you run out of TP.