This will explain why we are not getting the reading we want

17:30

better outdoors than in

maximize distance to net

No fans

Make sure aim is on point. 

Thank you, what I thought was interesting is how far the unit reads the ball once it leaves the matt. It reads up to fifty feet. Did you catch that 

at 08:36 he says "..out there on the range it can see the ball for 50 meters..." - that is 55 yards and 164 feet.

Started listening to this as well on the ride in and did catch the remark about reading the ball for 50 meters. Honestly given the size of the unit that is pretty impressive.

Obviously he works for Garmin so I take anything he says with a grain of salt but his comments seemed to indicate they were looking into measuring spin in some respect. He said more than once they are working on fine tuning spin but I am almost positive he slipped and said "measure spin" at one point. Obviously nothing concrete but if nothing else shows they are aware of and working on the spin number.