I used to be able to get a FT to hold with a fork/comb, but it won't do it now. Is it just that it's too long (approx 31")?

I can get it in place holding tight and it seems secure, but soon as I subject it to the "3 headshakes test" it falls out.

If it's too long, that would suck. I've just started bunning this year, and would like more options (all my bun varieties look alike). My hair isn't long enough for the log roll.