Actually there is a bit of leeway regarding how fast the heat builds up.
A .6 coil of 28g will rip
a .6 coil of 25g will be slow to overheat
The amount and type of wire comes into play on tuning a mechanical
mod just as much as resistance does.
I like that your being cautious and trying to learn. I think you will do well at rebuilding.
Let us know what happens and how it works out.
And make sure to keep askin cause we are happy to keep answering.