Replace Horrible ClickPad on Lenovo

I have a 2014/2015 Lenovo T540P which is an awesome machine in EVERY way but one.. the horrible ClickPad thing they implemented.  Seemingly to compete with the Apple Trackpad, I suppose.  The significant difference, however, is the top of an Apple Trackpad is not a clickable area.  And worse... Lenovo tried to emulate a 3-button trackpad.  Ugg.

First - I ordered a 3-button Trackpad replacement.  Replacing the trackpad was not exactly straight-forward, but it was pretty simple once you know what you are doing.

Remove keyboard bevel:
https://support.lenovo.com/us/en/documents/pd029714

Replace trackpad:
https://support.lenovo.com/us/en/videos/vid100173

After I replace the trackpad, I had a bizzare situation where if I was to click the "left-mouse-button" and drag my app around the screen, the cursor would jump around chaotically.

I messed around with the 50-synaptics.conf file, which did not help.  I believe the final fix was
[root@seraph ~] # xinput set-prop "AlpsPS/2 ALPS DualPoint TouchPad" "Device Accel Constant Deceleration" 1

Some other tweaks I had tried with the old ClickPad to make it behave better...

synclient AreaTopEdge=500

synclient HorizHysteresis=50

synclient VertHysteresis=50

synclient TapButton1=1

synclient TapButton2=2

synclient TapButton3=3

synclient PalmDetect=1

synclient PalmMinWidth=10

synclient PalmMinZ=100

synclient EmulateMidButtonTime=75