The current dressing choice does not make sense to me as you need something more absorbant than N/A ultra.
By leaving the dressing off after showering you are allowing the wound to cool and dry out. This is actually the opposite off what you want to be doing as an optimum healing environment is a warm moist one. Forget 'letting it air' and using dry dressings, that practice went out with the ark. Obviously it is hard for me to make a recommendation as I cannot see the wound to assess it. Your basic principles are to:
cleanse the wound disturbing the wound bed as little as possible (do not rub with gauze, cotton wool etc). I feel this is best achieved by irrigation with warm saline. You can get cans of this on prescription.
Base your dressing choice on the type of wound. A dry wound bed will require rehydration using a hydrocolloid or gel dressing. A wet wound will require a highly absorbant dressing that 'draws in' excess exudate whilst still maintaining a moist environment. The worst possible thing for the wound is mismanagement of exudate as this remains on the skin and causes further breakdown.
If there is suspicion of bacterial load in the wound, a silver based dressing can be useful, iodine based dressings are also very good.
I feel it is wrong that your husband is having to do your dressing, in light of the fact that it is a problematic wound you really should be being attended to by a nurse on a daily basis and I know for a fact that would be the case if you lived in my area. Have you been referred to a Tissue Viability nurse? If not, I would ask if this is possible and hopefully you have one in your area.