Need recommendations on a new system

I recently switched from disposables to the Smok Nord 4. I like it but the woman at my store said to stick with salt nic.

I like the Nord 4 but it does leak some. I also eventually want to move down to 6mg vape juice (I currently have unopened boxes of Cloud Nurdz) but I wasn’t sure I could do that with the Nord 4 (I struggle to understand coils)

Any advice on making the Nord 4 work or should I look at getting a new system? I love the size of the Nord and wouldn’t want to go too much larger