Just wanted to give some feedback after playing this build (subbed a few feats, I have to learn the hard way, always ...)
In the end I dropped improved precise shot, as you did. I noticed that mobs rarely lined up well enough that I could take full advantage of it. Without it you do 20% more damage of the bat and with the new AOE attacks this is even more noticable. In high reaper you don't necessarily want all the aggro before the melees get a chance to take some aggro. I really liked the build to (my surprise?), as I don't usually play ranged chars in DDO due to desyncing and lag. This chars and probably all ranged chars performance is quite dependent on dungeon layout. The larger area dungeons are insanely fun to play, small tunnels with mobs bunching up are not as fun, though the aoe's really help, especially the mass trip.
I landed surprisingly high on the kill list in r10 quests. The damage was pretty great and with the 90 standing INT (94 in Reaper) I didn't even have swap to disable items with the exception of raids, where I just wanted to make sure. Ended up with good saves (no fail evasion) and the defenses were ok. Next time I would perhaps try without body feat for a higher dodge, but less MRR. Will see how that turns out.
All in all had a great time playing this after years of not playing ranged or a trapper and will probably come back to it, bookmarked it for sure. Thanks again for sharing such a detailed build on here.