I think in the grand scheme of things my balance should be considered small.

According to your formula i should stake ~ once every 7 days, but my last stake was 16 days ago, and before that 5 weeks went by between stakes.

Its probably just the luck of the draw.

A better explanation of UTXO's would be nice. My balance is split in about 100 small amounts from 1.2 to 60 GRC, adding up to my grand total. Would it be better for me to add them together into a few bigger amounts?