Am I doing this right - inc calories to 10 x body wt

Hoping all those who don't choose to starve themselves can offer some advice/support please as I have a LONG way to go on my weight loss journey weighing in at a whopping 257 lbs. After reading the posts decided not to follow the MFP guidelines after I was delighted the first week to lose 6lbs straight off following 1600 calories but then realising my bmr was 1890. The next week I upped my calories to 10 x body weight 2570 and I am going into my third week and even though it was totm stayed the same throughout, went up a couple of pounds but now they have come off and am down one pound in total from where I started. I am going to wait it out another week because at my weight am thinking should be able to lose 4lbs in a month. At the end of next week I am thinking of UPPING my calories by another 10 per cent. I am trying to find my maintenance by the way doing all this (the point at which I don't lose/don't gain). I do some walking about 20 minutes most days and I go on my aero pilates machine for about 20 minutes, although this last week I had pain from my sciatic nerve so could not do even this. Due to the lack of exercise etc am just hoping I am still on the right track. I am in this for the long haul but feel guilty eating this much, weighing this much and doing not a lot. By the way I am a female, 46 and have yo yo'd most of my life. Thank you for reading. I would also like to add people as friends who believe eating more is the way to beating this cycle.