I know I'm late to the party, but I have a couple of suggestive points.
1) Turtle mode, this slows down the airframe response, which slows down the motor response. Which in turn will decrease the tendency to roll forward/backward/left/right.
2) As soon as your TH touches ground hold the throttle stick all the way down and the red button (I know I saw you already do this).
3) check all of the switches, make sure they are all centered before attempting a landing.
4) which ever way the airframe is tipping, give opposite input with the right stick (while holding the throttle and red button down), this will cause the airframe to right itself. Don't slam the opposite stick gently apply it.
5) If it starts to tip, bail on the landing, throttle out and try again. When you do this make sure you apply opposite roll so your airframe doesn't fly off in the direction it was trying to tip. Also, let go of the red button.
6) let RTH/RTL do its job (unless you are trying to land somewhere you didn't take off from). Get close to your landing area and flip the RTH switch to force a landing. With this method you also need to go into the controller settings and set your return altitude so the TH doesn't try to climb to sixty to eighty-five feet.
6) prop guards (yes, I know they were already mentioned).
7) Practice
8) Purchase a landing pad, Hoodman (look them up) has a very good weighted series which can take a prop impact. I've tipped over on the landing pad and it saved my props. Slighty pricey, but it's cheaper than replacing 20 sets of props.
9) Lastly, check the ST16 calibration. If you have yaw or roll out of sync, on landing it will be exaggerated.
ST16 Requires Calibration ?