I have used MM's hog injection recipe as noted in his first book (apple juice, vinegar, salt, sugar, and without the MSG) and also condensed down for backyard use in his second book. I injected two 8 lb butts and smoked them this past weekend with really good results. By comparison, I have also used Chris Lilly's. Honestly I have had good results with that one as well. I wouldn't say either one gives the meat an a "sweet" taste
If you are concerned about not being sweet enough to your likeness, I would ask what your rub consist of mainly (more salty or sweet?) and how much Worcestershire you are using? Worcestershire can really overpower if your portioning is not in line with the rest of your mixture.
Superior SS-2 / Mini WSM / GOSM Walmart Special Propane