I wanted to throw my IMS experience so far into the mix...
I purchased them a few months ago, PN IMS59-50222, so I am assuming they have the most current valving.
I have my front (Tundra TRD coils) adjusted to what would have been the lowest groove on a 5-way 5100.
No extra weight (yet) up front, but they're used in conjunction with SPC arms and Whitelined lowers.
The ride is pleasantly firmed up on road and particularly supportive at speed off road, but I am finding it a bit on the "resistant"
side on medium-speed trails (5-20mph) I have assumed my combo is likely best suited to some extra weight up front,
so I am not going to fault the current valving. That said, I wouldn't be opposed to trying a few different coils to see what
changes. I just wish it was slightly easier to switch things out - I'm currently using the vehicle itself as a spring compressor.
My biggest issue however, is a loud CRICK! type of sound that occasionally comes from somewhere up front that I can't
quite zero in on. I thought it might be too-loose top hat bushings, but I used Dob's guidance for bushing squish and no change.
It's likely user error somewhere - as I have changed many things up front at the same time, but still a bit frustrating as it never
made any noise even with leaking 5100s, missing CV boots, and completely roached bushings all around.
Could the TRD coil potentially be a weird fit? I only speculate that as my coil seat to bolt center height is 152mm - far from 213mm
and maybe it's creating some less-than-ideal cycling or coil clearance issues.
I have a set of 4th Gen rear 50701 IMS shocks waiting to meet my 890s once I get off my @ss to fab some outboard mounts.
Dobinsons stated they are the freshest batch that should be a good match - even for a 3rd Gen, and that the 50705 would
be phased out leaving the 701 as the remaining option. I'm happy to share my experience with them if y'all are interested...