You may need to either widen the hole or add another hole to the cartos to get it to feed your juice. I've noticed that the factory punched flanged cartos aren't PG friendly. I use a 10%vg/90%pg mix and I occasionally have to pull a few dry hits without activating the device to get it to refill. With thinner liquids it works fine. <br>
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I used a specialized hole reamer to widen a few of my cartos holes, but I suppose a nail or leather punch would probably work. Just be careful not to over-penetrate the cartos or you could hit the coil or center tube which would lead to leaking/draw issues.<br><br>The funny taste is probably due to not completely filling the carto. Top it off and verify that its filled, then let it sit and soak for a minute or two before firing it up. There might be a slightly off taste for the first few hits on a new carto, but it goes away after a minute or so if it was filled properly.