Frustrated with current Dahua offerings

[kidtriton 0]

I have been using the HFW4300S model for a couple of years. The company I work for is always expanding so I install around 10-12 cameras every couple of months. The 4300S has so much better images vs. the HFW1320S, HFW4421S, etc that I'm able to get on amazon now. I've tried them and sent them back due to the image being more grainy than the 4300S models I have all over my current installations. Has anyone else noticed that these new sensors aren't as good? Any suggestions on a good model in the 3-4mp range?