Is mfp giving me the right info???

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Hey guys, just need some help to work out what i need to be doing....

(Me) Male, 5ft 10", 246lbs, 26years, sedentary = 2888cals

Currently using mfp and struggling to eat the amount required on days i take dog for a walk for 2 to 3 hours up a winding mountain path. So my question is:

Is the 1630 cals needed per day really appropriate then adding exercise on the days i do it or can i average it over the week?

I have worked out my maintenance calorie allowance is 2888cals per day or 20,216 per week.

I also do strength training 3 days a week 1 hour each day, which totals 1151 cals per week. Along with walking the dog for say an average of 450mins per week equals another 3653 cals burned in total per week.

My target is 2lbs per week = 7000 cals, in total i burn roughly 4804 cals per week in exercise alone. Which leaves 2196 weekly cals for deficite to hit my target.

2196/7 = 314cals per day.

2888 - 314 = 2574cals

2574cals to eat per day. In order to achieve my goal of -2lbs per week. And not the 1600 mfp gives + exercise for that day.

Currently 2574 calls is not far off what mfp gives on 1600 + 1000 cals exercise day. and only 1600 on an inactive day.

Is mfp giving me to much of a deficit?

I currently aint getting my goal weight loss from mfp. Is what i've worked out correct? Can I restrict cals further? (or would this result in starvation mode?)

Please Help!!!