Starting again - week 1 weigh in

Week 1 is done - which was really more like 2 ish days.  Mostly just remembering how to get enough water in, how to track and journal foods and to be comfortable eating in a different and more mindful manner.
My trick to getting enough water is simple - I cant have anything with flavour until all my water for the day is in.  That means 3 of my refillable plastic bottle of water.  They are 800ml each, so that covers me for 64+oz.  I aim for one before lunch, one before dinner, and one in the evening, but if I drink them faster, I can have coffee or diet pop - things that taste good.  It isn't always fun but water is key to helping you lose weight.  it also helps you not to confuse thirst with hunger - I always try to have a good sized drink first if I think im hungry to see if that's the real problem.
I weighed 190 today, which was a loss of 1.5 lbs so far.  Some of that will be water weight, some of that is just my body adjusting to being back on track.
I did get a fitbit for Christmas.  So far I have discovered any day I work, I hit 10 flights of stairs and 10k steps without even thinking.  Which is what I cant figure out.  Basic pillars of good health - good healthy food (not too much), keeping moving, lots of water.  I do these things and am still significantly overweight.  I eat fresh fruits and veggies by choice.  I walk all the time.  I drink lots of water, even when im not keeping track.
My first thought was that maybe I was misestimating - but the fitbit tells me I really do move more than I thought I did.  My food scale tells me what I thought a serving was is actually smaller that what it should be.  Im fighting a battle against some nasty genetics and that is the part I don't know how to win.  How to reset my body to have a happy point at lower weight when all it wants genetically is to pack on the pudge?