Generally, if you are losing toenails the shoes are too small. Your toes should not be touching the end of the shoe even on a downhill run. It is important to lace them tightly enough, but not too tightly to prevent sliding in the shoe.
For insoles have you tried Walk-fit? They are quite strange and take at least 2-3 weeks for your feet to adjust. My first time I had to remove them after 1/2 mile. Now I run 12-15 miles and they feel great. I am hoping to train for another marathon but this time using these inserts.
I hate to say this but I don't find there to be that many "knowledgeable" people at running stores even. I have gone to multiple around my town and they don't even watch your gait on a treadmill - they watch how you walk and then tell you to put the shoes on and just run around the store to "see how they feel." I was told that I was "normal" so I bought neutral shoes. I started having knee pain and went to a ortho doc who sent me to a PT. Sorry to say but even the orthos don't really seem to know much. The PT finally helped me and had me running on a treadmill - she was shocked anyone told me I was "normal" apparently I have a very pronounced pronation. I got custom fitted for orthotics because I didn't want to go back to a running store to ask for over the counter orthotics because I don't trust anything they say. The custom fit orthotics have been EXCELLENT. I now still buy the neutral shoes because the orthotics should make them perfect and I haven't had any knee pain.
sorry to sound so pessimistic. Good luck!
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