Before explaining the strategies, we must define some expressions:
Total Rate = total gain / average balance [projected in %/year]
--> Total Rate = (total gain / number of days)*365.0 / average balance
The Use Rate is the percent of your capital used at a given time. For instance, if you have 10 BTC in your balance, of which 5 BTC is lent and 5 BTC is currently not lent (offered or not) --> then your Use Rate is 50%.
In this example, if you get a lending rate of 0.05%/day, you will "loose" 2.5mBTC/day, waiting for higher rates.