I can't answer that question, something you will have to figure out what is best for you.
I don't have a X sedan so I don't have personal experience but I did have a similar experience with the h-tech springs on my coupe. I can only regurgitate what I see and hear from others in regards to the X. This thread contains that info so I don't need to rehash. At this point you can send them back, bite the cost, and get the springs that Mike and others are saying will work better. Or, you can go ahead and install the ones you have and leave it at that. When people say the ride sucks with those springs I don't have a clue what they are comparing it to so maybe you may find it acceptable. If you don't then you have a set of used springs and wasted time or money getting them installed and getting alignments. Unfortunately you are in this situation and it sux.
If it were me I'd pay the shipping and get the springs others with an X have said works best. Obviously I can't take any blame for saying that if it goes to crap
