So maybe you have harvested a little more than I calculated ... 15.47 lbs or about 23 lbs/acre.
Since you are making a diligent effort to take measurements, I've attached an excel spreadsheet that you can log your catches in. Necessary fields in the data tab are DATE, #, & AVG LEN. You can enter the actual total weight or allow the SS to calculate based on standard weight and your estimate of RW. Their are two pivots on the other two tabs. After entering new data, you need to right click them and choose refresh to bring new data into the pivots. Hope it helps.
It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers