Another thing you might try is to send all your coins to yourself.  Since Coin Age is no longer a part of the PoS system, you need larger inputs to have a better chance of staking a block.  I usually send all my coins to myself (this creates one, large input).  Then as I keep staking, I'll eventually do this again as my inputs get smaller and smaller (each time you stake a block, your coin input halves, thus giving you two inputs - those inputs stake and halve, those inputs stake and halve, etc, etc).