ok, deepcool tesseract has:
1x120mm fan slot at the back
2x120mm on the side panel
2x120mm on the top and
1x120mm fan at the front.
what i suggest is put 2 fans as intake at the side
and if you wnat more then add 2 as exhausts at the top. that will fix your in-case temps.
Also, keep the psu's fan facing downwards for better thermals.
the psu position was designed so that excess heat from it doesn't enter the cabinet.