I've been going through the same issue of MEC powder bushings throwing a lighter charge than the MEC chart spec's. I've had to move up three bushing sizes to get the charge weight correct for the current recipe I'm using. Personally I don't find this to be a big deal because I'm a picky experienced reloader, but I do find it concerning for a new person to the loading game, knowing that if they just go by the chart, their loads could be significantly off, at least MEC bushings throw a lighter charge rather than a heavier one.
Something to keep in mind about what baffles are intended for. They keep a consistent weight of powder over the charge bushing before each throw of powder. Without one you can have variations in charge weights depending on how full or close to empty the powder bottle or tube is.
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