I take it, you've had your gait analysed and these are the type of running shoes that are correct for your specific foot type and strike etc??
Long ago I made the mistake of just buying generic trainers for running from a sport shop but then paid for it with shin splints and aching knees from the fact the shoes were neutral and it turns out I needed more support from a running shoe, as I have high arches and over pronate a fair bit.
If you haven't has this assessment, I highly recommend you do asap. As far as I know, The Gel pulse are geared towards neutral over pronation however the 2150s are for more serious over pronation, I could be wrong but this could be the issueas the support etc will be significantly different.
Hope this helps
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