No idea how I missed this thread almost a year ago, but the site is getting SO BIG.
I agree with Andy on pretty much everything he said. As a noob to 3D printing with only 40 or so successful prints, I have learned a lot (with quite a bit of help from Geo via PM)
I tried EVERY trick to get glass bed adhesion and nothing worked well for that first layer bond. I THOUGHT I had it down, then about a half hour into the print, it would pop, lift, or curl up an edge. Out of desperation and wanting to get a crank bait print done, I flipped the bed over to the plain glass side, cleaned it obsessively well with isopropyl alcohol and let her rip. Combined with changing the bed temp to 61 degrees in the LCD screen helped too. I found printing the PLA at 204 also helped with layer adhesion a lot, especially running at 100% speed.
I too struggled with bed leveling for a bit, tried feeler gauges, different papers etc. and it sort of worked but the first layer was still not perfect. Setting "level" with the bed at operating temperature turned out to be the key to a great first layer.
Maybe not the right place to bring this up, BUT. are the temperatures listed on the filament spool and recommended online the 'set' temperature on the machine, or the ACTUAL temperature verified by an infrared thermometer?