1) up the bed temperature slightly.
65 tends to help.

2) Buy better pla.
cheap pla will warp, good pla pretty much doesn't.

3) get some dimafix and use instead of gluestick. Stuff is great :-)

4) reduce the z-gap so the filament gets smooshed into the printbed.

5) print your first layer slower - what print speeds are you using ?
Good adhesion and release is a combination of print settings, bed material and print speed.

6) get a sheet of pei and stick it over your printbed. filament sticks to it when hot and releases when it cools.