Yup, silicone helps heaps with these. The 1mm O-rings can be hard to find, but my local stockist has 1.5mm ones available which I reckon would work just fine. You can't go too big or you get a lot of drag, but 1 and 1.5 will work, and 2 from the sounds of it, tho I've never used one that thick before. Would it be better to go for a smaller ID in that case?.