When you say pics, are they scans or prints or are you examining the negs with a loupe? If you're talking about prints then maybe it's your lab messing up, or maybe a focusing problem. What lens do you use?
My prints from T400CN and XP2 have given me superb sharpness. In fact, it's sharper than my regular HP5+ and other B&W films.
Using a red or orange filter on T400CN doesn't just change the contrast, but also the tonality of the captured image, which may be very different. C41 B&W films are capable of a huge contrast range, and you need control at the printing stage. Even if you use a red or orange filter, you need correct exposure and printing for T400CN.
Are you exposing correctly? Where are the prints made? Here's a tip : shoot at EI 200-250 next time. Don't bother with filters.
Its slightly different in that a picture which is stunning in colour maybe only mediocre in black and white.
You must remember that you are stripping a picture down to its bare bones shooting in black and white; you are relying on subtle differences in shades of black and white, on differences in contrast, and relying alot more on composition as being devioid of colour, your viewers now have to look more into these details to find something that grabs their attention.