Issues with the new landmass bp brushes

I’ve been playing around with the new landscape bp brushes and I’ve got a problem if somebody can give me some suggestions i tried posting this on the answer hub but it appears they are down Some times the brush will print a mountain but its very finicky I’m doing a open world landscape setup to use world composition and a landscape spread across 12 levels I’m told the two last points should connect automatically
some times it will right when i place in the level sometimes it will randomly after a while of messing around with it and sometimes it will not draw a mountain at all when it does draw a mountain right of the bat it preforms very slowly any suggestions as to what I’m doing wrong

I been having trouble getting blueprint brushes to work with world composition too. I wonder if anyone has a solution to this