I’m no expert but it sounds like your image train is now too long with the reducer added in I.e your sensor is now too far back from your focuser. Do you have spacers between your camera and your scopes/focuser? If so, you could try removing one or all of those
To be sure you could look up how far back your cameras sensor is supposed to be from your scopes focuser and then add or remove spacers as necessary. This is a pic of a 21mm spacer on mine to help explain what I’m talking about.
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