Financial snapshot- seeking opinions

scenario - 

4 investment properties -rehab and hold style ,  all consistently   rented ,acquired over past 10 years; Net monthly income 3k

Current primary home- 200k in equity expected at sale - saving this profit for future inv properties rather than pay down the new home- new home build @ 700k ;

20% down -150k (my cash out of inv property #4 ) to get 4% construction perm  loan with no pmi. 
mortgage will be 3200 including escrow .

My net salary from day job is 4800 per mo. 

Too much mortgage ?  My dti ratio is tight but ok with bank. I want to put least amount of cash into primary house to use it to make more investment income . My spouse is not quite sure of this “risky” strategy . She feels we should have little mortgage as possible ....