I guess i was pegged to be the voice of bastards then
To begin with you have 3 DMs in 27 seconds so i will assume a 30s+ fight
In 30 seconds you can reasonably get off 8 UIs, using your example NT you would have 40 base %nano damage and another 32 from active perks.
I calculated average IU and DM damage by adding min damage twice and max once then dividing by three ( to simulate effects of armor)
IU average: 6558 (double radiation add since the additional hit from using SI gets it too this will be added later tho)
DM average: 14559 +fire damage and add damage ( not put in now since those are not adjusted for % damage as far as i can tell)
IU over 30 seconds: 8*6558*1.72+ 8*(370*2)= 96158
DM over 30 seconds: 14559*3*1.72+3*( 500*1.72+2*370)= 79924
SI damage will increase marginally
Perk damage will go up by a fairly large chunk, CBA reconstructing that, sorry.
I believe that in the new "improved" Pande you will have a few nukes resisted and that DD crats will be grumpy at the lack of NR debuffing, pistol bursts will also drop in damage as you will be hitting with 0-1 bullet a lot of the time, you will lose crit damage as well.
So, my take from this is that your build is quite alright but not as ubah as it seemed at first, on lower AC mobs IU should pull ahead ( apf raids and such).
And finally i have to call you on your choice of toons to compare your DD with, the shade was crit build whut is no longer really good DD for shades compared to straight up add damage, the other toons were built for survival and soloing.
Disclaimer: people like me should not be made to do mathematics, it is entirely possible that i screwed up simple additions, so be warned