Regarding temp: Yes, 215°C / 420°F is a common starting temp. I use Rayon which is more like 460°F. But even with cotton it may be OK to go a bit higher, on the basis that the cotton will, hopefully, never be completely dry.
Regarding this "true max capable wattage", yeah, that sounds exactly like what the SXK mods do - no surprise given the heritage. And I hate it. Worst 'feature' ever. At least for TC.
In VW mode it may be OK - on low battery you don't have to stop vaping, you can keep vaping at a lower wattage that it gives you.
For TC, it's incredibly annoying. The trouble is, you're vaping away and then suddenly power reduces/vapour output reduces. So you think, "OK, I'm out of juice" - then you look, and realise you're not. So then you think "Damn, is there a problem with the build", and you access your build (hopefully not having to drain the tank to do that!) and you poke and you prod and maybe you check it on another mod, and it's fine. Then you think "Oh for god's sake, it's just because it's low on battery isn't it?" By which time 15 minutes has passed and now you're .......
Of course you get used to it, and start checking for it. But then the trouble is it's not clear at what level it kicks in. On one of my SXKs, it kicks in when the battery bar appears to be showing about 40%. Even checking the battery level carefully you wouldn't think it was low. And that's not because I'm using a poor battery, last time it happened it was with a one-month-old Sony VTC5.
Once you're used to it, you can tell when it's happening - at least you can on the SXKs. On the SXK mods, wattage cut because of TC issues will happen after flashing the Temperature Protection message. Wattage cut because of low battery will occur before/without the TP message flashing.
So if I start vaping and I see the wattage going down from the configured level without having yet seen a TP message, I know to change battery.
But I still hate the feature. Stupid idea, very poorly thought through, and it sucks that the Apollo has it - at least, assuming they've implemented it as badly. Maybe it's a bit better now, I hope so. Either way, at the very least it should be optional, with a shortcut to disable it.