Unresolved Z Height

Hello I only just got my Robo3d R1 for Christmas and up until today I had been using Mattercontrol to print and it was working fine, Today I installed the Full Graphic LCD and I am noticing that when you select stop print it will stop dead rather than parking like Mattercontrol would. I am just wondering whether this is something in the firmware or whether it is a gcode setting? I presume the former rather than the latter as I used Mattercontrol to create the gcode so it should be still sending out the same commands as if I was printing through usb yeah? Also I have a few issues with variations in the layer perimeters, so on tall prints the z axis will be wavy, even after I installed the z axis stabilizers but at the moment its not such a big deal as I am not doing too many tall prints. If it makes any difference I have only noticed that with PLA as I havent been able to successfully get an ABS print to stick... but I have 2kgs to learn with lol
Thankyou in advance for your help.

 

The stop park position is a signal sent from your computer to the printer. It's just a combination stop and move command. There might be something in the firmware for parking but I'm not sure. I usually just use the LCD move commands.

Generally I think what you're referring to is Z wobble. There's a few tricks to get it fixed that ziggy outlines here: http://forums.robo3dprinter.com/index.php?threads/z-axis-artifacts-known-issues-and-fixes.2576/