An important strategy note for everyone - do not unlock blueprint sets past around level 30 on most GB's, especially the Arc! Once you get to the 1.9 profitable levels of each GB, you need to unlock one level at a time and try to get guild mates or very good friends on 1st and 2nd right away so that you don't get sniped for 100's of profit by enemies or opportunistic hoodies.

At Arc 100 you are making 1% on each 1.9 thread investment. Sniping should make you a higher rate of return. Learn which players on your Friend List flip their buildings quickly and focus on those people's GBs. Work up to Arc 120 and 50K investment back, with fast flipping friends.

We have a requirement for 80 Arc 60 Observatory and 60 Atom . Guild members level them for new members a lot. If you need goods get people to work on obs after arc, mild incentives seem to work well. Top gbg players pay fp to them, goods and prints available for free, full boost from high arcs etc.
My 1.9 tips: Always fill highest to lowest. Only add just enough points so that spots lock. Unlock new levels with bps one at a time and only when you are ready to work on them. For the profit zone levels (especially around 40) consider making sure 1.9 donors are online prior to unlocking the level. At the very least, only unlock and post it
I level all of my great buildings with this tool. So helpful and easy to use for FoE Android mobile. I can adjust quickly between 1.9, 1.92, etc. One suggestion: allow each line to have a different contribution ratio. For example, I've been in situations power leveling an Arc where the top two donors want to give 1.92 while the others give 1.9.
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forge of empires arc 1.9