OK... a few questions.... (note it's been years since I've been a new pre-op, so things may have changed)...
Did your doctor do the fill under fluoroscopy or just in his office??? If he did it under fluoroscopy, with a barium swallow, then my guess is that the fill amount is O.K. If not, he may just proceed very slowly because he doesn't use fluoroscopy and doesn't want you to be too restricted.
Personally, 0.5 as a first fill seems extremely small to me. In my day, the typical first fill was 1.5-2.0 ccs... and even with that, most people would find that they'd be back at the doctors in a month or two for their next fill.
You're right... this is a tool. It will work.... but you need to be patient. It can take two-four fills before you find your sweet spot.
How's your exercise going?? Do you wear a pedometer, do walk away the pounds, anything?? For me, even when I needed a fill, I found that upping (or restarting) my exercise program often had great results... both in how I felt emotionally/physically and in weight loss.