Marcel, one way to utilize the SCE to improve load times, or so I've been told, is to make different profiles. For instance, if you are going to fly SAK, make a profile with all unrelated scenery areas de-activated. If you're going to be flying RTMM, de-activate everything except RTMM and the pertaining full-FAT region and save it as a profile, etc. Haven't actually tried it myself, but it makes sense.
My load times...like you mentioned, would hang at about %70 and take maybe 4-5 minutes to complete. My solution was to install a SSD after my HDD crashed. All the difference in the world. Load times are reduced to seconds instead of minutes. I was amazed at the difference. Brad and others recommended the SSD solution and they were right.
jsapair