Triangle Titus vs Rega R5

Hi!
I was trying to upgrade the my Titus 202 with something similar but with more weight; the obvious choice would have been a larger Triangle model. With that in mind I headed over Stereotypes in PDX last year; they didn't have any Triangles but insisted that I try some Rega R5 speakers. I took them home and found that I quite liked the mids but not the high frequencies nor the lower midbass. I took them back to the dealer and asked for a return but they gave me the runaround about replacements. I had to leave PDX in a hurry for a year (family stuff), when I came back I found that they still had the R5's in storage. They insist that the problem lies in my room (glass, slanted ceilings) and my amps (restored Scott LK7/McIntosh 7100) and that I should just replace the tweeters, the amp (with a Rega) and use some room treatment. YES, I KNOW... but at this point is either legal action or trying to make the Regas work. I have to consider both. At this point, more than a year after the original purchase, I have to consider that I probably won't get my money back without spending even more on litigation. Do you think is worth spending the money to replace the tweeters? Can the sloppy bass be somewhat tamed by placement/treatment?