I probably shouldn't try to answer for Bob since he's more than capable of explaining this himself, but I'll try anyway.
Bob's "slow, slow, quick, quick" ( I think he's got the copyright ) is a tempo that starts slow and accelerates to the release. For many bowlers this works well and is reasonably safe advice to give to someone who you haven't seen bowl.
Since we haven't seen you bowl, we really don't have the slightest idea of whether you need to slow down or speed up. For timing with a four step approach, the push-away should be complete when your ball side foot touches down. as the foot touches the floor you should let the ball drop into the swing. At the end of the third step the ball should be at the top of the back swing. Doing one step drills lets you develop a feel for when the ball stops rising and letting gravity send it into the last part of the swing.
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