OK,
I tried this here.
I imported your equipment profile (which actually had a mash tun specific heat of 0.21, Calc boil volume checked, a 3 gallon post boil volume, boil off of 1.19 and 4.19 gal total boil volume) and put it in my equipment profiles permanently.
Then I imported your recipe and put it in My Recipes folder.
I opened your recipe, clicked on the equipment button and selected your equipment profile. Then I checked it - all looked good so I pressed OK and saved the recipe.
Then I opened the recipe, checked it again and all of the equipment was the same as your original imported profile.
Then I closed the program, opened it again and checked the recipe equipment settings - still no change.
Not sure exactly what's going on - the settings here all stayed the same. However I am running a slightly newer version (albeit I don't recall making any changes to this part of the program). I'm publishing the latest version (build 40) very shortly for everyone.
It looks like it is storing the equipment properly.
Brad