Point i was trying to make is that in all the advice from people before me, who have used tc, no one pointed out that 600 is the limit and maybe a new tc person shouldnt be trying 550 right out of the gates...a lot of premade coils will say 500/550 max depending on the coil material.
Me personally, i vape anywhere between 390 and 430 tops on any wire for any coil i build (around 0.5/0.6)....currently (because the weathers hot in Sydney) im down at 390. Many go higher than my max.
Given thats my personal settings/preference (i dont like a hot vape), but the increase to from 430 to 550 is a fair distance, try somewhere in the middle and see how you go.
Me when i first started tc it wouldnt have occurred to me to start anywhere else but lower and working my way up, same as i would with the watts on variable voltage mods before i gave them up for tc. I never fired a coil on a vw at its rated recommended or anywhere near close to maximum...always started 10w lower than specified and worked up...saves you from making that "ive just swallowed a gob full of ... tasting crap" face, and doesnt stress the coil...
So i suggest the same basic theory, start a bit lower and increase until it suits your vaping style/preference, you'll know if your next adjustment up should be a leap (if its whispy) or a step (once it starts getting warm)