If I'm not too late to throw in my 2-cents' worth:
If your extruder is clicking, then 1). your nozzle is too close to the previous layer and is blocking the filament from extruding, or, 2) you're trying to push filament out faster than the melted filament can leave the nozzle (check the calibration of the extruder rate). Yeah, the gear set screw has to be tight.
FYI, I print big and small prints with (American-made) PLA on glass, with the nozzle (.4mm) at 185-195 C. (depending on filament color), and bed temp. at 40 C. I use Aqua Net Extra Super Hold Hairspray (the best my local Dollar Store carries). I print without a brim on small prints-less than 50mm x 50mm, and a 2mm brim on larger prints. I have a small fan blowing on the extruder housing (Prusa i3) and no fan blowing on the bed. If my print is small, I may reduce the nozzle temp 5-8 dergrees. NO PROBLEMS.
That's about all I have to say....


Wes