How long ago did you complete your poly and BI?
What’s your order of the whole process?
Mine was BI on the field, then forms, security interview, poly and psych.
It’s been almost a year since I applied, 6 months since I submitted my sf86. I am also a naturalized U.S. citizen with three letter agency.
I think you should try to search for DOHA case and be better prepared.
Look up all the guidelines, especially foreign influence.
I would just search google with this
“ PRC site: https://doha.ogc.osd.mil”
Trust me, I spent months studying probably hundreds of cases. To this end I have determined it is all up to the best lawyer one can retain and the judge. Read file of someone with over millions dollars of equity/property in the US yet still got rejected because he talked to his family overseas once a week…or paying them small amount of monthly financial support…even the subject’s core family (wife, kids, even in laws) are Us citizens. The subject is also from ROC instead of PRC…
I also saw cases where individuals from Pakistan with brother in the military plus a small property , guess what, he got granted for access.
I did notice a trend that being dishonest on SF86, no matter how trivial it is, is almost an immediate disqualification.
Good luck!!