Don't get stuck on the laid back 540. It's now time to turn that into a proper sideswipe.
1st change: Swing your non-kicking leg up straight instead of bent. When you reach the peak of the swing, bent it in and swipe with your other leg over.
2nd change: Take off exactly like you would for a high raiz. That means you should spot straight behind you instead of to the side. Push out your chest and swing your arms wide into the flip. Just like you would for the raiz.
These two changes should be enough transform your laid back 540 into a sideswipe. Remember to spot your landing.