My initial plan was to do exactly what jamal did. Sadly (well I look at it as a good thing), my skillup rate on petrified logs was relatively fast and only came out with about 6.5 stacks of ancient lumber. I instead decided to go with the plan of breaking mithran rods from 79-83 (.8 to go). This is a fairly slow path, but if you did lu shang breaking to 80, you should be used to it. After getting 83, I'm going to use my store of ancient lumber to hit 84 on wands then as far as I can go on poles. I have several stacks of kamarita arrowheads which will easily get me to 91. I would imagine that the likelihood of you leveling the bonecraft sub is pretty high whether you want to now or not, so I would recommend getting it out of the way for a relatively easy and profitable synth to 91. As far as the 90-100 range, I would occassionally make a plan of attack for minimal loss (if not gain) on synths, but the market ends up changing drastically and I'd change my plan. I gave up on making a new plan every month and decided to wait until I'm actually 90+ to decide.