Nice work on those Bogies Andrew,
They look superb, as for the fronts I think the 74 does look a bit better but the DC one is ok too. Though I am no expert. I don't really remember the class 71's. I only remember seeing the 74's in a scrap line at Eastleigh open day I think 1978. I don't remember seeing them running, though I am sure I would have seen them pass through Sway in the mid 70s.
A head on shot of 74004 I found on Flickr shows that your rubbing plate could come up a bit but apart from that it looks pretty good.
Cheers Peter.