It should make a big difference. Hold your foot up in the air, boot and ski on it. Support yourself with your poles so you won't fall over. The ski should be as vertical as you can get it, not touching the snow. Rotate the ski leftie-rightie vigorously. Does your foot twist inside the boot? If yes, then the boot is too wide for your foot. Every left-right movement of your foot should immediately move the ski. Your foot is your steering wheel. No loose steering wheels allowed!
Sit in a chair, in your boots, in the lodge. Pick one boot up and pound its heel down onto the floor, to drive your heel as deep as it will go in the heel pocket. Then stand up. Are those toes touching the front wall of the boot? They should be. If not, the boot is too short. Any fore-aft movement of your foot should immediately move the ski. No loose steering wheels!
Stand up in your boot. Buckle it not tight, but not stupid loose either. Do you feel the ceiling of the boot touching the top of your foot over the arch (this is your instep)? If not, the boot is too tall for your foot. You should not have to clamp down on the buckles so hard that the plastic of the boot is deformed, in order to get the ceiling to touch the top of your foot. Any up-down movement of your foot should immediately move the ski. No loose steering wheels!
This is why bootfitters are important; they can find a boot whose shape fits your foot's anatomy the best, then punch and grind it to fit around whatever bulges your foot has. They can do other important things associated with those boots too, but this is where it all starts. Good fit comes first.
Your description shows you need new boots.
Edited by LiquidFeet - 10/26/13 at 9:07am