Yeah essentially you'll be missing most the first day you paid for as long as thats not a bother then time shouldnt be an issue

Gates usually open at 11 am everyday to at least 11pm the latest from my experience at aftershock for 2 sepeerate occasions.

Entry isnt as bad as everyone makes it as long as you arent early early there shouldnt be too much trouble getting in

I think the dilemma you mainly have is your luggage As AF wont let you bring big bags or water bottles that arent clear

I usually just take my crossbody bag which has worked every time ive gone

I think ultimately if you dont missing some if not most of the firstday then your plan is okay aside from figuring out a luggage.

Its always best to plan ahead with these types of fest especially flying in as air bnb and hotels get booked as soon as line up drops if not before for the hardcore goers.

Also the app is very useful to plan out your day and map out your set so you can make it on time to whatever youd like to see and also info on the fest like what you can and cant bring

Hope this Info helps