A couple of seconds for the suggestions about verifying the CG, I use the IMAC test of an inverted 45 degree climb and it should continue on that path at least several seconds when you let go of the sticks. The actual recommendation I've seen is that it should begin to slightly nose over after that several seconds, I like my CG far enough back that it will just continue on rather than start to nose over.

Then there is the prop, yeah I'm big on the 8 pitch too but if the engine is idling too high it can be more difficult to land. I use a "flight idle" setting with a mix to kick up the engine idle while flying as mine will idle so slow it makes me a bit nervous to just fly it that way. Most of the GS guys around here do the same thing so I tried that rather than the clicking the idle up before takeoff and back down to land, works great.

The other issue you may be having is one I had when learning to get these bigger models down. That is to establish a higher angle of attack (AOA) on your final approach and putting the model into more of a slow flight mode rather than a glide. Now there are various ways to do that as you get more familiar with the idea, but the easiest way to learn it is to just flatten out your glide a bit on final and the model will slow down and begin to settle faster. Add just a touch of throttle and remember that throttle controls alititude, or in this case the descent rate, and elevator controls attitude. VERY important you remember that one.

Then just let her settle in and cut the throttle as it touches down. You will probably find that an occasional throttle blip will be needed to control the descent rate and remember the rudder is your friend. You should experiment with this and slow flight maneuvers in general at a safe altitude before trying it on landing since it is an Extra and it'll tell you if you've violated the rules rather abruptly when you do..

Hope that helps you as it did my landings.