This is my idea about the size of the bobber......first of all, I use a slip cork all the time with one of those rubber bobber stoppers and I do not use a swivel...how many of us are looking at the bobber (cork) 100% of the time....have you ever looked away and looked back to see your cork gone.....of course we have....I have found that I can detect a bite on most any size cork.....well, not huge ones...what I want most is a good, quick hookset....if I am not looking at the cork, I want the cork itself to help in that hookset and I feel that a cork that offers some resistance does that...I look at it like this...if your line (with a hook) gets slightly caught on your hand, not penetrating but barely sticking you, then with no resistance or pressure through the line it comes off easily....add pressure to the line and it could penetrate the skin.....I want my cork to offer some resistance to begin a good hookset when they take it and head down.....I have not noticed that my cork affects the bite any at all....now, let me mention that I mainly use a cork with shiners or jigs....and the shiners can move that cork around pretty good....sometimes even laying it down.....that is usually when the shiner is trying to get away from a fish....when you see that, get ready....sometimes you have to ease back on it to check to see if a fish took it....I use a hefty round weight about 6 to 8 inches above the hook...I add 2 weights if I am fishing deep like 10 ft or more to get my shiner down quick....I use a pear shaped cork like 3 for a dollar...

Just another fishermans opinion....worked for me for 65 years.....

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