The instructor who handled my transition into the 360 said the same thing. He told me to only use full flap when coming into the eventual new home for the airplane, which is a 2600/2900ft runway (differing displaced thresholds on either end), or anything equally short.

I initially experienced the same thing, smoother touchdowns with 30 degs...but eventually I just started using 40 all the time, wanting to use a consistent procedure. I use 80kias if it it's just me in the airplane, or 83kts if I'm heavy...and I can routinely grease it if I'm paying enough attention. 12.5-13" of MP on final on a typical glide path gets the job done.

What speeds are you using on final?

Here's a compilation of some of my earlier landings after buying the airplane: http://www.youtube.com/watch?v=Oq-YtaIzL38

Note the float on the 2nd ldg (85kts, half tanks, just me, ie, light). Shortly after that, I transitioned to 80 on final.  There's also an example in the video of landing at Aeroflex Andover, which is just under 2000ft, water on both ends.  Coming in too fast there would be a punishing experience.

Keith