BenQ projectors are all HDCP compliant. They are extremely well regarded as entry level models. They have better black levels, motion handling, and out of the box colors compared to other models in the same price class.
Their parent company (ownership) is Qisda which is one of the HDMI certified adopting companies. All their projectors are HDCP compliant. I'm unaware of any current manufacturers using HDMI which are not HDCP compliant. Just to be clear on this, the owner's manual for the W1070 says that the HDMI input is HDCP compliant. Moreso, thousands of owners haven't had issues. It's just not a bad product.
So, while you may have gotten some flunky on chat, the reality is that if you used a DIFFERENT HDMI cable and a short distance between the source and projector, then whatever issue occurs are not typical.
In the price range (sub $1,000), the BenQ models are typically considered the best on the market. But, there are options from others which utilize a 6x RGB/RGB color wheel.
Anyway, typical screen size is 10" to 12" of diagonal for each foot of viewing distance. So, 110" diagonal from 12' of viewing is typical, if a tiny bit small, but nothing wrong there. I've seen much larger from much closer, with a happy customer.
Is your screen high? Well, yeah, it may be a bit high, but it depends on whether or not you are using recliners constantly or not. Typical screen height should be setup with your eyes between the halfway point and bottom quarter point of the screen. So, a foot or so high at least.
Anyway, if you are really irked by what is going on and BenQ won't help you and it isn't under warranty for some reason, then that's a fluke. Most people have no issue with theirs and they've had incredibly high reliability.