When PLA lifts at corners of a print, should i raise bed temp?
A corner lifting is thermal expansion at work. Raise bed temp in 5c increments. Probably shouldn't need to exceed 70c for PLA. An IR thermometer can help establish the right 'actual' bed temp.
The Textured Power Coated sheet is PEI. Same cleanliness rules apply. Touching the sheet with bare hands is a very bad idea if you want PLA to stick. A single fingerprint will migrate with time and coat the entire sheet with oil (experience talking).
Wash & dry hands; then wash bed using a drop or two of detergent and a paper towel; dry with a new paper towel handing only the edges of the sheet. Then rinse with 91% or better alcohol and dry with a fresh paper towel.
ps: Some people who can't seem to wash the bed properly resort to sanding. Sanding doesn't work on a textured bed unless you sand blast to get into the divots. I was at the point of trying sanding (I was really frustrated), but finally found I was touching the bed way too much and it took several washings to get the bed clean, using ONLY fresh paper towels after each step. Dish rags, sponges, dish towels, all leave extra crap. Anti-bacterial detergent isn't a good choice, either. It doesn't rinse well.