Do you have that design kit installed though? Just because you're not using it in your example does not mean that it won't have an influence... it may still have code being loaded via the .cdsinit file.
You could repeat your test by doing:
and then in the CIW entering:
envSetVal("adexl.icrpStartup" "binaryName" 'string "virtuoso -nocdsinit")
before starting ADE XL.