What capacitor values?

You might need an inductor on the woofer. What are the other cap values and why do you feel they are not the right value?

I tried to help you;) Didnt tell ya to shit can anything. Pretty hard to rework a network of a custom speaker that has no info available but what little you listed. You should be happy anyone took there time to post. And I design loudspeakers and yes we mostly use simple networks with costly parts or use no crossovers at all with some designs. Just that most 12in woofers have rising responce mostly arround 2khz up. So most 12in and larger woofers need at least a basic crossover to reduce this peak. I know of only a few that dont and these are costly alnico mag woofers aaa few vintage. Thus the inductor sugestion which would be sudo 1st order no phase shift -6db slope. And still might improve your sound quality.