With your pension and your husband's income you have more income than the SWA rate. This is why the CWO cannot pay you anything, rather than anything else.
One thing you could try is to set out that your average earnings for the year are no longer representative of your husband's CURRENT income (if of course, this is the case). If for example he had a run of work at the start of the year and things have dried up with little prospect of returning to previous levels, then you can ask for a different period to be used rather than the standard 52 weeks. It is common enough for them to use the last 13 weeks or 26 weeks if you can show that this is more representative.
For you not to be entitled to an increase for your husband, he would have to have an income of more than 300 Euro a week. You would have to be getting a fairly big regular payment from relatives to bring you over this rate.
Depending on the circumstances you could appeal the decision to refuse the increase for a qualified adult. It would depend on the nature and regularity of the payment from your relatives whether this should have been considered as income.