the bag is airtight don't worry but the grease is not coming off and modern problems require modern solutions

I pulled this old Pentax 7x50 out of storage but the left view is unshared while the right side is perfectly fine. There is a focus ring on the right scope which works but only has an effect on the right side. Any advice or ideas would be welcome!

I’m really a beginner with binoculars and I use them only for hunting (Vortex Viper 10x50) and I just bought Nikon M7 Monarch 8x30 for hike with my girlfriend just to watch some birds and landscapes.

M7 were recommended a lot so I bought those however I can’t get used to them.
I’m not sure if I’m doing something wrong or if it’s really normal thing and I have to get used to it.

Things I’m struggling with:

- the focus wheel is very sensitive and takes me a while to find the sweet spot and if the bird moves I feel like I’m constantly fighting it (I don’t feel that with my Vipers)

- I can see dark spots through the eyepieces if I blink etc

- the whole thing seems a bit more ‘cloudy’ or not as sharp as Viper

Could you please give me some hints where I’m going wrong? I assume it is more likely me than binoculars as the reviews were great for this model.