PJ2. It is Allotinus unicolor. Spot 6 (biggest spot) on the hindwing lies well to the inside of spot 7.
PJ3. Note the subspecific name. Dusun tua, Malay for old orchard , after the Sungai(or spelt Sungei) Tua (River Old) area.
PJ4. A wonderful find. Amathusia perakana perakana.
This is easily ID'ed as the hindwing pale subdiscal band is broken & its upper end is an isolated spot.
PJ4. Eurema ida iona is right. Two cell spots; rounded forewing; note hindwing black streak in space 7 is in line & joins the cellend bar, as in E. andersonii.