So today I decided to do Enmity testing with a fellow linkshell mate that had GLA at 50, here are the results.

2 Gladiators Setup, No gear.

1st Gladiator provoked, Mob on him. 2nd Gladiator provoked, mob stayed on 1st Gladiator.

1st Gladiator provoked, mob on him. 2nd Gladiator provoked with +10 enmity belt, mob turned to 2nd Gladiator

1st Gladiator provoked, mob on him. 2nd Gladiator flashed mob stayed with 1st Gladiator

1st Gladiator provoked, mob on him. 2nd Gladiator flashed x2 mob turned to 2nd Gladiator

1st Gladiator provoked, mob on him. 2nd Gladiator flashed x2 mob turned to 2nd Gladiator. 1st Gladiator flashed, mob turned to 1st Gladiator

1st Gladiator provoked, mob on him. 2nd Gladiator flashed with +10 enmity, mob stayed on 1st Gladiator

1st Gladiator provoked, mob on him. 2nd Gladiator used sentinel and then provoke mob turned to 2nd Gladiator

1st Gladiator provoked, mob on him. 2nd Gladiator provoked no change, 2nd Gladiator then used rampart, mob turned to 2nd Gladiator

1st Gladiator used sentinel & provoke, mob on him. 2nd Gladiator Flashed x2, mob turned to 2nd Gladiator

1st Gladiator used sentinel & provoke, mob on him. 2nd Gladiator provoked & rampart, mob turned to 2nd Gladiator

1st Gladiator used sentinel & provoke, mob on him. 2nd Gladiator flashed, no change, 2nd Gladiator then used rampart, mob turned to 2nd Gladiator

Gladiator & a DoH Class (Stone Throw test)

1st Gladiator provoked. DoH did stone throw 158 times for a total of 571 damage before mob turned on DoH

1st Gladiator Flashed. DoH did stone throw 113 times for 381 damage before mob turned on DoH

1st Gladiator Sentinel and then provoked. DoH did stone throw 266 times for 677 damage before mob turned on DoH

Summary:

Provoke is the highest enmity spike ability.
Flash is roughly 2/3 enmity of provoke.
Provoke is equal to 571 points of damage
Flash is equal to 381 points of damage
Sentinel adds roughly 100 points of enmity to each ability that is used while under the effect of sentinel

I will be conducting stage 2 of Enmity testing which will involve finding the static value of rampart, and cure spells. If you have any questions please feel free to ask.