I have a bit of an IEM noob question, since I have always used foam tips (the stock CA ones and Comply). I have lately been trying Spiral Dots and Symbio tips with the Andros. With the Spiral Dots I get a big vacuum pressure kind of effect, while I don't get the same with the Symbio tips. I also get much more bass from the Spiral Dots than the Symbio, but not sure if that is because I am not getting a proper seal with the Symbio or due to inherent differences. Does the vacuum effect with the Spiral Dots indicate a proper seal or me inserting them incorrectly?