Don't eat 1400 cals a day, it's just too low, go for a 20% deficit for awhile and see how that goes. You have some numbers, how are you monitoring intake, or have you been?
I would skip the brekkie if u can, protein/fat lunch, big evening meal with carbs from veggies etc. if you are not exercising hard, eating starchy foods might just hinder your progress, might not though, u need to experiment.
Whatever u do, u need to be able to sustain it. The greatest plan is crap if u give up. Monitor intake, weigh in every few days, adjust fortnightly if u need to.
Btw, have u actually tried eating at your calculated maintenance level to see if u actually do maintain? That's what I would do for the first 2 weeks