I believe will power has a good role to play in the new band lifestyle. Staying away from sugars in very smart and the dense proteins will keep you fuller for longer. I personal eat a lot of turkey, fish, chicken, and beans. For grains I eat whole wheat bread, oats and flax seed. My veggies are corn, carrots, green beans, broccoli, califlower, brussel sprouts, aspargus, soy beans, ect...As for fruits I stick to berries and bananas.
My diet is great until I make my sweet choices....then I completely bomb. I am a work in progress and I have come along way on the mental journey. I've been a HUGE emotional eater. That does not change when you get the band. For me that is my area for change.
Personally, I have not had my band so tight I couldn't eat without vomiting or PBing. I also don't keep my band so tight I struggle to drink my liquids either. I have had a few times when my band was tight first thing in the morning due to hormones, even that has been rare.
You sound like you are doing really good! Stay focused and keep on keeping on. Band tightness is a personal choice. Only you will know when you need a fill.