Kwikset locks all use the whisper protocol when they are being added to the z-wave network. You need to have the lock a lot closer to a router node than 30 feet to get it added into the network. Once it’s added to the network it will operate and can respond at decent distance from the next nearest router node.
I have Kwiksets at several different locations that I’ve got HA at and anytime I’m building out a new site I get the deadbolt all put into the door and properly “handed” and then I’ll get it as close as I can to one of my routers (or generally the system running HA) and add it. That may mean needing to take it back off the door :-/ and wire it all up near my control system.