Yes, 75% util is very high and lowering your score. It could also make you a target for AA. 0% CC util lowers my EQ score a little but raises my TU a lot. You could always let $1 on your CC report if you loose points. If DH's account is your oldest TL, you could loose some points for AAoA going down. If so you could always add it back. IMHO you need to get DH to lower his util since it is hurting his score as well.
1/25/2021: FICO 850 EQ 848 TU 847 EX