Helix syn – how far??

I just got a helix syn and have tried it twice. My question is about insertion depth. There are two "narrow" areas by the base – one that is somewhat contoured, and one that is really narrow, but very "short." How far should this thing go in? All the way to the very very narrowest point, or just the more contoured narrow spot, which is where it likes to get "sucked" up to naturally? I tried briefly to go for the narrowest point, but it seemed like it wasn't going to happen. Any thoughts? pic for reference:

http://dnok91peocsw3.cloudfront.net/product/361877-610×610-1364228089-primary.png

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