It isn't supported by the source material that Spider-Man suddenly canonically has similar powers to the Hulk and can increase his powers by thousands of times. This is just a rationalisation for that the handbooks are blatantly inaccurate. That is all.
My apologies, but I do not have the available time to argue further about this, as I am extremely overworked and distracted.
I have reached a conclusion here, and think that we should close this thread.