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When mine come up to temp (195-205 for pulling), I remove from foil, and drop the shoulder with drippings in a roasting bag. Seal tight and put the foil back on. Wrap in a towel and drop in a cooler for 1-4 hours.
The roasting bag seals the juices in and let that thing steam itself into oblivion. You will have soft bark (otherwise known as "no bark") but in my opinion, is well worth it.
i'm pretty sure a little higher cooking temperature would have made a big difference here. people get married to the "225" plan and while that is good in many situations i believe it doesn't apply to all. this could be one of those times.