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If you are getting your stars focused OK in live-view but the resulting images are blurry then it could possibly be focuser slip caused by the weight of the camera which is relatively common (& causes many headaches). A quality after-market focuser should have a focus lock/tension adjustment knob.
If you aren't able to achieve focus through live-view then it's likely you need more inward focus & a low-profile focuser as you originally suggested might help. Getting the correct sized one will be critical however to ensure you can achieve focus both using the camera as well as with an eyepiece for visual.
Good luck.
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