first point: Looks like you could reduce your air pressure.
second point: Before Gapping, try to get your backwheel realy close to the edge(take a short look at your rear wheel before attempting to jump). Then you have to "press" your Tyre into the edge of the wall(you more or less just push your chest forward), sometimes you can nearly feel the rim when doing this. Remember that you can use your Tyre as some kind of spring.
I hope this will help you.
edit: learning this will take quit a lot attempts, but it will result in much better gaps