You sure hardest forestry is a good idea?
It basically means that any bee can for no particular reason, turn into a swarmer.
I don't think that's difficulty more so Making Bees completely useless.
Perhaps ExtraUtilities - adds a bunch if neat blocks, and IIRC one can disable any in the config if they seem too OP.
Thaumcraft may be interesting, and actually useful now that GT prevents you powering through Tech to the point where Thaumcraft/Thaumic Tinker is obselete.
Especially if you add something like Infernal mobs, which seems to be very popular these days, Thaumcraft weapons may help considerably, at the cost of a considerable investment.