Well not the easiest thing to answer really. To start with we have no way of knowing if you have set your wrench correctly - no offence, but it's like someone posting a thread called "can anyone hear that noise?' Know what I mean? But on what you have said, I would say it sounds a bit light. OK doing the 37 isn't exactly a gym workout, but the +90 is definitely tight. No, not what I would call dogged up tight, but 400mm wrench and a good 'Hmmph, that's tight'. Not eye ball, sphincter straining tight like a crankshaft pulley bolt, no. If you think that with a standard ratchet you could put a couple more tuns on, then that really doesn't sound right. And they're new stretch bolts yes? Sorry not read back on your posts.
Chris