Good to hear OP has solved issues 1 and 2.
In terms of 3 - I find I get a good solid 2.5 days from my Watch 5 pro LTE, although that's with minimal/nil usage of LTE/GPS functions..
My main bugbear with the watch is that it doesn't lie/sit completely flat - so I cant use my wireless charging pad unless I take one end of the watch strap off...