I don't have a BG but I have some side snap minkee BB and they always wick really quickly on Lockie with their combo insert in. Are the one size ones better?
MY LO is in BG's quite a lot and I have never had any problems.
I bought 17 BG's of which 4 I have sold but the rest are in use all the time, but No problem. Its only the colour that I got bored of TBH.