Hi! Thanks for your reply , to be honest i have zero problems with the drop from the chainring (yep is narrow wide).... The problem is just on the derailleur. this morning a friend sayd to use some spacers to move the chainring as more inside possible to make it more stable. I got some spacers and i'am going to test it....

In case that spacers will still fail can you recommend me the cheap shadow derailleur i can find or other types specific for 1x conversion.