I believe those sims in the OP were full index but to double check I updated CVCX to 5.0132 and ran new sims. I used the canned strategy under Stanford Wong 'Old Complete High-Low' and made sure to uncheck 'European no hole card' which is automatically checked under 'affecting options' on the page that you attach the strategy. The sims came back with similar numbers but I finally figured out what was happening when I was playing around with the configuration. It seems that if you have 'no dealer hole card dealt' checked then the 'ENHC' will stay on even if you uncheck it. I unchecked it. Opened up the attached strategy page and sure enough it had automatically rechecked that option. I ran sims with my own indices and they were as you would expect: OBO with similar numbers to hole card games.

Mystery solved. Thanks for the attention to this issue Norm.