I'd reccomend finding a fan/fin/shroud assembly on eBay from a 3070 that someone has pulled off of their GPU to replace with liquid cooking. They're very common for 3080 and 3090 cards but haven't searched any for 3070s. They may be harder to find but if you can score one, should work much better than what you currently have as long as it's a 3070 with the same VRAM config.
If that doesn't work, this might be an even better option from NZXT.
I'd reccomend finding a fan/fin/shroud assembly on eBay from a 3070 that someone has pulled off of their GPU to replace with liquid cooking. They're very common for 3080 and 3090 cards but haven't searched any for 3070s. They may be harder to find but if you can score one, should work much better than what you currently have as long as it's a 3070 with the same VRAM config.
If that doesn't work, this might be an even better option from NZXT.
https://nzxt.com/product/kraken-g12
With this.
https://nzxt.com/product/kraken-240