Definitely all about the jumping technique. This method worked for me personally. Even managed to get a 235 up from 210 on my best jump so far, but it may or may not work for you.
The fundamental concept is to aim to jump high, not far. If you aim to jump far, your forward momentum will be greater, but I find it sacrifices too much of your air time. In the end, you do not have enough air time to make use of the forward momentum. You will have to practice on this because it takes at least a few jumps to get the hang of jumping high.
As you're in the air, stretch your body backwards like a rubber, with your arms going as far back and upwards as possible and your two legs as far back as possible. The focus here is to get your legs as far back as possible in preparation for the next step. I find the arm thing helps with pulling your body backwards, but that's up to you to decide.
The last and most important step is to kick your legs in front right as you're about to land. This gives you the extra few cm that you wouldn't have gotten if you had just tried to keep your legs in front through the whole jump (unless you have super powerful abs). For this step, it is important to keep practicing. Kick too early and you end up having your legs bounce back a bit, losing you some distance, but kick too late and you're going to kick into the ground and fall down.
One often overlooked part of the body to train for SBJ are your abs, because without a good core you won't be able to do a lot of things well, such as, in our case, either keeping your legs close to your body or kicking your legs to the front.