This is exactly what I was going to suggest. RB may have the same 255 bar (or 240) problem but should be able to import or copy as many bars as you want. When i get home one test is say you've done all that, have your 327 bars and want an additional 30. Can you highlight the next 30 bars and generate? I would use the next empty track for that and do it one track at a time, not all tracks at once.

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.