first off,you never want to use propecia with deca. deca itself converts to dhn,not dht. dhn is a very weak androgen witha very weak affinity to the scalp. using propecia will prevent deca's conversion to dhn,thus causing more hair loss. theoretically,propecia only works with testosterones,not derivatives.
although primobolan is a weak androgen,it does have properties similar to dht as does winstrol,this could explain hairloss from both of these drugs. the are derivatives of dht,not actual dht but similar in structure.
anavar and deca is a safe cycle for hairloss but don't use propecia during this.