There's another option here too. I wonder if you're not adding enough up trim to slow the model down. If you just let it settle into whatever glide speed it's happy with as set by your cruise speed trim then it's quite possible that it's gliding fast for that reason.

So many of us forget that the elevator trim function is actually a PRIMARY control in full sized aircraft. The idea is to set the glide in a level or slightly nose high position that is about 1/2 way from the cruise to stall speed or a bit slower and then let the drag of making all that lift at a lower speed settle the airplane down to the ground in a flat manner.

This method was pressed home to me a few years back when I flew a Quickie 500 as a sport model. With its racing heritage it was clean and would glide forever if I put the nose down at all and let it have some speed. The only way to ensure it would land decently was to hang it up like above and let it settle in. I used to use a steep banked turn to bleed off the speed at the end of the landing approach and make sure it came out of that turn nose high and set up for the mushy approach.

You'll be playing with the stall of course so practice this at first with the standard "2 mistakes worth" of altitude under your model to get the hang of it.

Because I use the elevator trim so much I've added a 3/4 inch 2-56 screw set into the knob so I can find and use the trim quickly and easily.