We're not a big fan of trust logos either - though if you do want one it's included. As well as the tests you mentioned, usertesting.com ran some tests where removing them aids conversion:
http://info.usertesting.com/OnDemandWebinarOptimizeYourWebFo... at 36:15
> This is a case study I borrowed from Pep at ConversionExcel, that tested this for one of his clients. This is the original one"
https://certsimple.com/images/blog/trust-seals-stop-conversi...
> I'll show you the variation here. He removed some from fields, he also treated the copy copy and he also removed the stuff over here (the trust seals), so there's multiple things going on.
https://certsimple.com/images/blog/removing-trust-seals-conv...
> What I want to show you is that =the version without all the other stuff and the trust seals converted better=.
https://certsimple.com/images/blog/removing-trust-seals-conv...
There's also another study (trying to find link) where they found making your own trust logo improved conversions.
As with the nature of user testing: other people's results may not apply to you. Measure yourself.