Since bodyfat percentages are tricky, at best (and even those examples use different methods including the very scientific "estimated") I'm going to interpret this as, "My long-term goal is 165-170 with defined abs."
Keeping that in mind, and given your current condition (167 with no abs), what does your current training and nutrition look like?
Also, for reference, what are your current bests in the squat, deadlift, bench, and overhead press? I'm looking to compare where you were versus your last thread in December, where you were 10 pounds heavier and talking about strength loss.
Sounds like you're talking about the stereotypical "bulked up and got fat, going to cut, then going to bulk 'smart'" approach. I think you're getting tripped up trying to nail down specific timeframes for things that haven't happened yet. 15 weeks for this, then 6 months for that, when all you've really done so far, from what we've seen, is drop bodyweight (not saying dropped bodyfat, because I'm pretty sure you burned plenty of whatever muscle you had along the way).
I'd suggest thinking more globally and shooting for a "re-comp" or whatever the kids are calling it nowadays. Eat smart (maybe trim carbs on non-training days), hit the weights and hard conditioning with a good pre-designed routine, watch for strength in the gym to go up (including in the moderate rep range) while bodyweight stays close to the same, take weekly or biweekly pics to assess progress and fine-tune as needed.