Nivek is right... keep the insoles incase you wanna sell the boots off. but those are pretty flimsy and floppy. New supportive insoles will be a bit more ridged. plan to spend 30-50 bucks
Also if you have fallen arches will make boots weird to size... Insoles will help keep arches arched and stop your foot from flattening out (getting longer)
IF you only just got them they should be a a little tight... feeling your toe in front of the boot is ok (but not curled up)... if you tie up the boots and flex your boot do you feel the toe pull back off the front??? if so probably jsut a case of breaking in... Heat molding only goes so far... having your foot in the boot jumping around, creating heat, is where the real molding takes place.