Making wounds apply as a percentage of your max hp rather than as a flat value and having medicines heal in the same way would be a simple solution. If you have 300 hhp with gildings and you get hit down to 240 hhp (20% of your hhp gone) and then remove your gear, you should just be at 160 hhp (also 20% of your hhp). If medicines healed as a percentage as well it would heal no slower or faster if you remove gear.
That or just remove const from gear and replace it with something else