If you go the puller bung or side puller route and your topkits are rated to say 20 elastic, you will get away with using a lighter elastic due to the fact when you pull on it you are putting more pressure on it, I have side pullers in some of my kits using from solid 10 elastic to 17h hollo elastic, and funny enough I rarely use them preferring to play the fish as normal. I have seen anglers fishing open water and stripping elastic like it was going out of fashion just because they have pullers fitted. I will use mine if fish are heading for a snag but on the venues I fish that is rare, I have removed the number one section from my match kits and have single strand of number 6 elastic on a standard winder bung on one kit and double number 6 on the same set up on another, A tip if using side pullers is to use a longer piece of elastic than required and slide a snug fitting rubber bead onto it before tying off where it exits side of pole section, This acts as a tensioner, have the bead down to the section for a tighter set up and away from it to fish with softer set up, you can still strip elastic if required when playing a fish.I usually have mine down to the section when fishing across to an island, it is set tight enough to slow a fish down on first run,