Use 10% chrome alum and use about 2 ml on plates and 5 ml on paper. But then we don't know which emulsion and what the gelatin content is. That is important!!! My assumption is 5 - 10% gelatin. And processing at 68 F (20C). And using no Dektol or stop bath. These are all critical concerns. Or can be.
I use the c.alum for plates. FYI, I mixed my emulsion with food gelatin from grocery, in my country it's very hard to find photography gelatin and even Knox gelatin.