After leveling my printbed the typical way using a sheet of computer paper, I sometimes fine-tune by starting to print the object itself while adjusting the thumbscrew levelers on the fly. This allows me to micro-adjust the thickness of the material for the object I'm actually trying to print, insuring good coverage for that critical first layer. I usually add a decent-sized brim for the object I'm printing during this phase, so I get several passes around the object's "outline" to adjust the thumbscrews (whether the final print needs a brim or not). Then I print the object with or without the brim as is optimal for whatever I'm printing.
Another trick to reduce/eliminate pull-up is to do the same as above, but then stop the print once you have an outline of your print on the printbed. I then get a fine sharpie and trace the outline on the glass bed. Then, I remove the deposited outline of the print from the printbed.
Then, I use ye' olde glue stick, applying where the sharpie outline is. (Sharpie and glue stick residue remove easily with rubbing alcohol, and I keep a chemistry H20 dispenser of same right by my printer so I can squirt some on my printbed to clean it off after the print is done...) If there's glue over the sharpie, the sharpie won't get on your print, and if it does, it removes easily with the alcohol...
Happy printing!