I have an apple watch SE 1 st gen that is running the latest software version, I have various health issues, and it's super important to track my heart rate. my gripe with my SE is that 1) the hr sensor is really slow and takes a while to load, and 2) I can't wear it at night cause of the battery. so my question is would it be worth upgrading to the series 8? I can't find much information on whether the sensor is better in the newer watches. Thanks in advanced