I don't understand? You claim to have a weekly profit of 5.067, however your NAV went from 116.13 to 107.28, which to me looks like you should be reporting a loss of 8.85?
In your analysis you say RentalStarter is stagnating, I think that is a narrowminded view of the situation. This is an asset which is dollar/physical asset based, so the recent increase of the BTC price should have pushed the price downward, the fact that the price of RentalStarter stayed pretty consistent means that it has increased in value along with bitcoins.
Profits and losses are calculated from realised value in BTC denomination from trading and dividends etc.
This see's options as units and ignores their fluctuating value
NAV is simply a snapshot of the current value of all assets.
I do this as a way of accounting. It works.
If you are only interested in the actual value of Sandstorm just concentrate on the NAV. Keep in mind every dividend paid attacks the NAV.