Take a screenshot while holding your mouse cursor over both the helm and boots that you're trying to combine so I can see their options.
Both of your bloodangel items have only (SX) excellent options that are specific to Season10 so you cannot use them to mix Wings Level 3. Your item(s) need to have atleast one regular excellent option such as Reflect Damage 5%, Damage Decrease 4%, DSR, etc. Example: Excellent Bloodangel Lord Boots + Increase Maximum Life by 165 + Damage Decrease 4% will work. Excellent Bloodangel Lord Boots + Damage Decrease by 45 + Reflect Damage 5% will work. Excellent Bloodangel Lord Boots + Increase Maximum Life by 165 + Damage Decrease by 45 will not work.
That's also a (SX) excellent option. The regular excellent option for zen is "Amount of Zen acquired for hunting monsters +30%"
It wasn't your day, better luck next time but my advice would be to go with +13 ~ +15 excellent items that have luck, not +9. Items similar to great dragon, dark soul, etc are recommended.