you adjust the settings for the warm up to be whatever you want clickwise, but mostly I just hold the trigger down for a few seconds before I start inhaling with on demand mode as a sort of manual preheat... I honestly have not experimented with the warm up feature much, I am either on demand or just cruising for a long time anyway...
Regarding the temp control, it is a calculation based off of resistance, and you're talking about a heating element which you're pulling heat off of through a load, so there is really no way to measure the actual temperature of the load... This is just a common issue with pure convection vapes, so here it is just going to be relative you will use it and you will learn what feels like what to you, personally I find my attempts to be pretty accurate for reference, but like yeah it depends how you draw how you pack, that all affects temperatures so yeah you just can't really compare it to another vape especially if you're talking about like a session conduction vape, those are completely different technology so it's never going to be exactly like that... Having said that, mine is pretty consistent and well balanced and not unlike that experience, but I'm just saying you're going to need to spend a lot of time with it to really get the feel for you. Best thing to do with any new vape is to use only it for a while so you can really overcome the learning curve, if you are used to a different type of vape it makes it more of a struggle for some people... Anyway kind of rambling but it's tough to explain as your experience varies, I have no idea what you would be comparing it to, like tinymight is its own and so is grasshopper in my experience.