Warrior Kick / Monk Flying Kick / Rogue Backstab Calculation

[Namsaknoi]

I am posting here instead of bug forum because I'm not trying to dispute or request changes but just to discuss if I am calculating correctly

For delay, I just used stopwatch to time the refresh timer with all haste items and buffs/songs removed, on P99, don't think they differ on live, and there could be latency discrepancy since general consensus for Backstab delay seem to be '10 sec' whereas I have it at 10.5

Is below correct?

Warrior Kick
Damage:5
Delay: 85 (8.5sec)
Max Damage: (Kick skill 210 + Strength 255)/100 * damage 5 = 23.25, rounded down to 23
Have chance to stun after 55

Monk Flying Kick
Damage: 30
Delay: 90 (9.0sec)
Max Damage: (Flying Kick skill 225 + Strength 255)/100 * damage 30 = 144.00
With Inner Fire it is 288, Thunderkick is somewhere in low 200s, not quite double but somewhere half way up similar to other critical hits (but not crippling blow or deadly strike)

Rogue Backstab
Delay: 105 (10.5sec)
Base Damage: Weapon damage 15 * (2+(Backstab skill 225 * 0.02))+ Damage bonus (Level 60 - 25)/3 = 109.17
Max Damage Multiplier: ((Piercing 252 + Strength 255)/100) * Base Damage = 553.48, rounded down to 553
Double Attack is applied after 55
On P99 it seem to be somewhere south of 530, and 500+ damage happens rarely, but I remember rogues having 553, or 1106 with Duelist, or 1106 + 1106 for Duelist + Double Attack on their signature was the trend at that time until 16 damage piercer appeared late Luclin, and max damage happened rather frequently on live

Some side notes:
Monk 1hb/2hb/h2h skill cap was 252/252/246, not 252/252/252, h2h increased to 252 late Velious
Rogue piercing/1hs/1hb cap was 252/250/240, not 250/250/250, 1hb increased to 250 in PoP
Warrior weapon skill caps are correct on P99

Max damage calculation should use weapon skills instead of Offense skill for calculation, and no '-75' applies, there seem to be some debate on Game Mechanics section and currently accepted is 'Offense skill' + 'no -75', but this should be incorrect. Offense should only count towards atk calculation, while weapon skill counts towards max damage calculation as well as atk calculation, which would also be more logical