It always scared me when teachers tell people that they have weak fingers and tell them to strengthen then.. I can see how buckling fingertips can be a problem but it seems like the problem is not so much on strength but coordination..
Also i guess a lot of the problem i am having comes unintentionally and it's only discovered after listening to myself on a recording. Often times what I hear when i am playing and what is happening after listening to the recording is completely different. I would find out how uneven i am playing only after I listen to the recording. This has been a huge source frustration for me .