what is the weakest link in my audio chain

Yeah, try swaping out that HD power cord you're using for speaker wires with one run of adequate length 11 conductor sprinkler wire, or two lengths per side of 7 conductor, and see what you think! Then YOU'LL know. Good luck

If yoy're happy with the sound then your Bryston amp has to be warm sounding since Paradigm Studio v2 has bright unforgiving tweeter (Vifa).

This is a popular misconception, IMHO. I have the same setup as Benqsun, except I have 60's for the fronts instead of the 40's. I've owned mine for 5-6 years and brightness has never been an issue for me.

Cruz

V1 tweeters were horrible and V2 are a little better but still on the bright side - I know I have 60s v2 and recently got rid of original $25 Vifa tweeters. You might find reviews describing Paradigm v2 as neutral or crisp but you won't find single one calling them "warm sounding".

If brightness is not an issue for you - great.

This is from "Audio Ideas Guide" review of Studio 40 v2 (link in Audiogon reviews):

"The Paradigm has a slightly more forward quality, but is otherwise a very neutral reproducer. That extra on-axis energy between 5 and 7 kHz can be heard, and if it were tamed by about 2 dB, the Studio/40 would be, in my opinion, a virtually perfect dynamic loudspeaker."

I don't think I ever remember ANY Paradigm speaker I ever sold, EVER sounding bright, from my recollection. Infact, I think they're a little shy in the treble from what I remember.
And the Bryston should keep the sound mellow.
I like a little more extended amp with those speakers, really. But, experiences vary.
Personally, I think people here some setup somewhere, where they hear some tonal character, and they make assumptions! Can't tell you how many times over the years I've heard bad combo's of gear, only to have people make assumptions about one piece of equipment in the chain - as if the sound was coming from only that specific component!
Um, no, the paradigms were never bright. Infact, I dare anyone to find any reviews that describes a paradigm speaker as having a bright ANYTHING!

What do you mean? - I just posted excerpt from the "Audio Ideas Review" stating that speaker is slightly forward.

Problem with reviews is that every reviewed speaker sounds like the best in the world. Reviewers will never use words like "bright, edgy etc" but instead they hint speaker balance. In "Son Hi-Fi" review of studio 60 v2 it says:

"The overall reproduction of sound was particularly clear, which, under some circumstances, can become less pleasing, e.g., when listening to soprano voice, the high notes could sometimes seem slightly acute"

User in Paradigm Studio review posted on Audioasylum.com stated:

"They are not a forgiving speaker, but not overly bright."

That pretty much what aluminium dome tweeters do. Beryllium tweeters are way to expensive - as well as good soft dome tweeters. In addition dispersion angle of the Vifa tweeter is poor and sweet spot for listening is pretty narrow. Paradigm 60 v2 has in addition a slightly muddy midrange.

Paradigm is a very good deal for the money (since Canadian government is paying for the research) sounding better than speakers few times the cost but there is a difference between $1k, $5k and $25k speakers. Reviewers have certain expectations within given price range and if you find poor review of $25k speaker it doesn't mean that it is worse than Paradigm.

Paradagims $25 Vifa tweeter cannot and doesn't sound as clean as soft dome Morel Supreme 110 that costs 10x more (just replaced them). Sweet spot is much wider as well.