Oztent rx5 water pooling

This isn't common, but in heavy downpour I've had massive water pooling, I'm guessing that since rx5 has a bigger surface and in a heavy downpour it just starts to accumulate so fast that instead of running off it pools, I had over 4-5 bucket loads of water pool in there. To oztents credit, I'm impressed that the tent didn't tear or collapse. Has anyone found this problem? Worked out a solid solution?
The only idea I've come up with is using a tarp save like this https://supapeg.com.au/tarp-saver/ But I really want to avoid having a pole running in the middle of the tent. The attached image shows where the water pools. A c-clip ridgeline would be ideal but there's nowhere to attach it on the tentside. I know it looks like it needs to be tightened but these images are after the stretch, the tent wat pretty taut, image 2 has water in it.