I would agree with those who say 80-100 for a singlewall rim, which would suggest your spoke tension is too low. However, you may want to verify that the tensiometer is actually correct, having a known good wheel with proper tension will tell you if it is in the ballpark though unless you know what its actually at won't give you precise accuracy. Even Parktool meters have been known to be inaccurate from the factory since they just spec a spring and make the charts based on the expected results from that spring type, springs of course vary. This is why Wheelsmith meters the chart was based of the tool's actual reading of a tensioned spoke with a known reading. Its also why the wheelsmiths were expected to be sent in every few years depending on number of wheels built and have a new chart made to reflect the actual results of the tool. Test the tool before presuming the wheel is that far off. Also, the big advantage of the tool isn't its perfect accuracy to spoke tension but its ability to tell you how accurate the spokes are in relation to each other, having a wheel with tension that isn't perfect but all the same is still a better build then spokes with wildly varied tensions.