Matt pointed out that maximum deflection of the blades will occur at the 90 degree point not at the 45 degree mount that is provided by Safari. If you take reading at the 45 deg point then move the pickup to the 90 point the ips witll increase initially.
If you really want your ship smooth then work on the maximum readings available at this position.
Also with this mount you don't have to twist the cable to screw it in.
The final advantage is that it makes it easy to figure out where to put the balancing weights, as you no longer need the polar charts.