Here's the thing, PLA, statistically speaking requires much less heat. So ironically, although heating it more would seem more logical, it's actually the wrong thing to do. 190 is about the right temperature. But even at that temperature you will have trouble, and here's why.
I'm sure, like the rest of us, you bought your Press with the knowledge that it'll print PLA, right? WRONG. The Press is NOT equipped to print PLA. Since PLA is much softer than ABS, the excess heat that comes off of the actual nozzle travels up towards where those two skipping gears are (feeding PLA). When that happens, the PLA gets too soft at the feeding point, giving the gears the ability to bend and stretch the PLA line, however not melt it. This of course is when we are talking about a consistent straight extrusion (not a project).
When printing a project, the extruder consistently pulls the feed up and down in patterns according to your project of course. So if the PLA is soft at the gear point, and the extruder is pulling the filament in and out as per your project, this causes Buckling. Buckling means that the PLA makes a slight bulb where the gears are (the line get's thicker at that point), causing the uneven extrusion and thumping noise. Think of it as pushing two lines of play-doe together, they will make a bump/buckle/bubble at the weak point.
Every other printer on the market that is said to print PLA has a PLA fan – Yep, a fan right by those feeding gears, that way, regardless of the excess heat traveling up there, the PLA stays cool, preventing buckling (slight melting) where it's not supposed to.
So, the Solidoodle Press is not made for PLA, although it says on the website it can handle PLA...hmm I smell a lawsuit.