The stem /ZĘ/ seems likely to have been moved from final into medial position in the sign-group A08, to give a room for a final /- P/ in the scratched area, which looks like a dumping place for all kind of signs; but the highest distinction is no doubt dedecaded to sign P. Experts in nothing else, but photographic recognition of imprints, ought to be allowed to re-examine the disc in situ for an immediate releasement of the result.
25 year ago as a youngster, I decided to devote all my strenght on finding the message behind the Phaistos disc inscription. Having succeded this blindfolded double- marathon (360 degrees around the clock). Only thing left was to show forward my result, being prepared for the wake of enthusiasm. Unless that someone in need of own results offends against the rules, you've gained the promised land. A potential obstacle left was this (ferro-) efflorescent area in signgroup A08, but went upside down the sign P seems to emerge.
Now this inscription is no longer the concern of philologists, but only of interest for mathematicians. - Rather to be compared to papyrus Rhind from Egypt, than to syllabic linear scripts.