Iron Heart 888 or 777

Hello to you all, I have purchased my first Iron Heart jeans in the 666. However measuring 8.5 on the leg inner it seems like a boot cut, compared to my normal jeans. I was wondering if I should go for the 777 or 888, ideally I would like a 7 inch inner leg seam. My preference would be high rise with a 7inch leg. Perhaps as a 51 year old 36w the slimmer style is not the way forward? Any suggestions