Yes, it was installed above all Orbx sceneries but it didn't work that way, unfortunately.
Just a little update guys: thanks to replacement AFCADs provided by @Troyboy (which essentially correct the scenery's elevation to match CRM's) the FSXScenery scenery is now functioning perfectly and blending in well with Orbx CRM. If anyone's facing the same issue, you can DM either me or him and we should be able to send them over.
Issue resolved!