If you're stressed or in some low mood because of your diet you can't lose nearly the same weight. 170 is probably healthy for you if you cant run it off with that kind of work.
You might still be able to lose 10 pounds of chubb if you have it. Depending on your situation with your body even if you have fat it might be healthy.
If you know you can still lose 10 to 15 then I say cut to 1000 calories (of good stuff) and load up on green vegatables/ grains. Maintain some level of protein like roast or boiled chicken.
You're basically semi starving. Then start eating 1500 and see what it does. If you can sustain 155 or whatever you hit for say a month then you're probably eventually going to be able to maintain it regularly with medium work.
But after you hit your target I would up to 1500 and see what it does. If you gain a ton back just eating healthy then you might want to stay put at 170 and let your frame make the transition.
Sometimes you just cant do it all in one weight drop and sometimes even if you do it's temporary or unhealthy.
As a sidenote (IF YOU CAN HANDLE IT) I cheat every few day when I start obsessing over something sweet. I get a shitty mood and there's no energy or motivation in that state. So a couple times a week (including cheat day) I might grab a tootsie roll or a sucker, something small along those lines. Helps me.
Good luck going from tits to twelve pack.