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Hi Rebecca, Your 20inch diameter barrel is, I assume, about a metre high so should be sizeable enough for the plant. Since you've gotten the vine to its 3rd year & trained it, you are definitely doing something right.  So, here are a few questions/suggestions which may not be applicable to you (as you may already be doing them):
Did you top dress the compost/soil in the spring? If you want it to grow happily & fruit, you should be feeding (a high potash feed) it once a week. & it has to be kept sufficiently & steadily watered, if it doesn't stay appropriately watered the vine will get very sad indeed. I'm not sure how large (width wise) you've gotten the spurs along your trellis, but if your barrel isn't that tall (less than a metre), you may want to check & see if it has become pot bound. For a youngish vine, I wouldn't suspect it would be pot bound though. I've never had the problem you've mentioned, but for all of my container plants I top dress & feed/water regularly. I enjoy the consistent care required  Hope that helps. If not, maybe another 'MyGardener' may be able to help you out. All the best
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