Don't be fooled by the use of double legged kickstands on motorcycles because the pedaling action compromises their use for most regular bicycles. In my opinion double legged kickstands for bicycles aren't as stable as single leg kickstands because:
1. They're often mounted lower. Single leg kickstands are often mounted on the chainstays as opposed to below the bottom bracket.
2. They aren't as wide. Think about it, for a given stand length leaning the bike will always give a wider stance.

Also, most often the way a bike falls over is the front fork turns sideways and the wheel rolls. So if you're not satisfied with your kickstand I recommend (in order of priority):
1. A strap to lock the front brake.
2. A strap to keep the front fork from turning.
3. A higher mounting kickstand...the ultimate being something which holds the bike at the top like a "clickstand" brand kickstand.