Think indeed you need to create 1 mm of distance between the PTFE and the Hot-end-isolator (metal part with holes). You do this by turning the hot-end-isolator. You may need the heat the nozzle a bit to be able to.
another thing, why did you change filament diameter to 2.95 ? is it because you actually use thicker filament? if so this can be a reason for under-extrusion due to higher friction in the bowden tube, you should better stick to 2.85 mm filament.
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neotko 1,417
Some other user might help you more but for what I see the ptfe coupler and the metal part need 1mm space
https://ultimaker.com/en/community/view/9513-underextrusion-need-help-with-this-one#reply-84942
http://umgallery.ultimaker.com/uploads/gallery/album_27/sml_gallery_341_27_243635.png
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