regenerative braking

Hi, I've owned a 2022 Niro EV for about 3 months now; I've driven it around 2,900 miles so far, including a road trip from Detroit to DC & back which I've documented on my blog. So far I absolutely love the car, but I have a couple of questions; I apologize if these have already been answered...

I am a 2012 Volt owner who has always driven in L, so I am used to (and love!) the regenerative braking. Earlier this year (spring 2019), coincidentally(?) just after having my summer tires put back on, my regenerative breaking feels significantly reduced. It feels about halfway to being in D...

OK, so I'm new to the EV scene. I can't find, in all that Hyundai docs that they provide, an overall explanation of when to incorporate the RG system into my daily driving. I'm gathering that it be primarily used during braking. Should I have it set at 1 all the time, and increase to 2, or...