One thing i just fort of, in the early days of 3d printing, I had a old solidoodle, the hot end wouldnt go past 230 without crashing.

So i had it set to 229c @ 35mm per sec. And because my bed couldnt get past 60c. I used blue painters tape to get it to stick. Didnt come with a part cooling fan. So they were off.

But i imagine your printer is abit more modern. You may be printing your pla at too low temps. Some people say 180c, i print at 200c, and have with some printers 210c. The higher the temp of the pla, the stronger it will be as theres better layer adhesion. But this may effect print quality.