i have put both ifcx3 and ifcx4 into propeller. I haven’t had an issue to date. you are importing the IFC as a design to Stratus?
My current issue is when I export out of SU and import it into TBC, it comes out of scale and is exploded - so I guess my question is first do you have a scale fix and once I get it back into TBC assuming I position it correctly and scaled, do you just use the exporter CAD>IFC exporter?
when you say explode, i assume you mean that each member is its own entity inside of the IFC file. TBC will let you wire frame your IFC and those settings may effect export.
I model the solids from TBC items so i can place them later. . Export from TBC as a .skp from the cad tab. make solids in SuP, select the objects from sketch-up, make them a group, and export as ifc or .trb and import to TBC (there is a workflow to skip this portion but i am not fluid in it. Also note that this is MY workflow and may not be the most efficient or even the right way to go about it. It’s the way that works for me.) it will drop at 0,0,0. This is were having the reference data originating in TBC comes in handy. Select the members of the .ifc and move them (3d) to the location required. the 3d move will populate the delta elevation and should adjust to the elevation shown. there may be some minor adjustments to do for placement but i can usually get it placed in a click or two. Once it is placed to your liking, export as .ifc from the CAD tab and bring into Propeller as a design.
below is a ifc import from TBC to Propeller.
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Man this worked out great on my end. Got 4 Barrel box culvert showing in there now. It turns out I am using the online version of SuP and I needed to export to TRB from Trimble connect. Once I did that it all kind of fell in line and worked out perfectly. Thanks for the help.
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word. solids all day 
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Copy that Nate.
I appreciate the information.