Well, it looks like I may be on my way this morning.
First, I added two lines to the config.sys from an Adaptec readme, basedev=aicj78u2.add, and a line CopyFromFloppy=1 (i wouldnever have thought of that second one).
Then I remmed out all then "basedev=" lines relating to drivers I had to delete from Disk 1 to make room for the 78u2 driver.
Now things have gone through, and I am engaging in the usual familiar Warp4 installation process.
Thanks for your suggestions and help.