I'd suggest asking questions not just about what akrasia fighting methods they tried and the outcome, but about the how and why of those methods. For instance (I think these can fit into one toplevel comment, they're all on the same subject):

For every treatment type marked as 'tried', you can ask if they still use it, why they stopped (akrasia, superseded by better method, etc), how long they used it, how many times they tried it again after quitting, how long the intervals of quitting were...

What motivated each time they tried a method (first time or not) - vital task they had to accomplish, fighting akrasia in general, social pressure...

What motivated the choice of method on each try (anecdote told by a personal acquaitance, literature, akrasia help groups, retrying something that worked last time but they quit doing anyway...)