which lense?

Hello. Have a problem of getting sharpen images.
I am using canon 400D and own 85mm f/1.8 , 50mm f/1.4 and 20mm f/2.8 . I am happy with my 85mm and 50mm lense, but can not use them that often, cause shootting mostly indoors, where my space is limited. For my photo shoots i am using 3 D-Lite 400 heads and whide angle lense ( 20mm f/2.8).
Could anyone recomend to me which choise of lense would be the best to use indoors with limited space shootting glamour and portrait style pictures?
Thank you a lot!

DId you already say that you don't have enough room to use a 50 or 85? Portraits are usually done with one of those. What don't you like about the 20/2.8 other than its perspective? How about 35mm?