I thought Mantlo was just occassional fill-in work at that point.
PAD wrote Spectacular 112-113
Len Kaminski wrote #114
PAD wrote Spectacular 115-119.
Mantlo wrote 120.
PAD then wrote 121-123.
McKenzie wrote 124.
Danny Fingeroth wrote 125-126.
Kaminski wrote 127.
PAD wrote 128-129.
Layton wrote 130.
131-133 were crossovers.
PAD wrote 134-136.
Then Gerry Conway took over.
I will give a shout-out to Fingeroth, given the decent comics he wrote in the 80s, and the impact of his Foes of Spider-Man mini-series.