bro.., keep your focus on Advanced...,you already have the capability of 265 +
it is not like you have to give the exam of English but you studying Economics ...
let's think logically.., Advanced prep is much more tougher than mains..So if you go for Advanced prep your preparation level anyway be higher than the mains..
May be you can cover those extra topics as well..,which are in mains but not in Advanced..
Don't lower your aim..
You should not be regretting later on that you didn't aim for the best..
This is my view..,rest depends on you...
Good Luck !