I dropped in at Pakwaan last week as well - was in the area around 1ish, dropped in and had their buffet. Not the best way to judge a place, probably, at a buffet and not all that early either (their buffet starts at 11:30 IIRC).. but even so, the food was warm enough. However, it feels like I went to a completely different restaurant to the one you did, as you'll probably see from some of my comments below
The wait staff (a male/female tag team) brought us complimentary tastings of fresh squeezed juice (vegetable and "sugar cane"). The veggie was acceptable, but the sugar cane was way too sweet for human consumption. Then came complimentary bowls of chicken-corn soup which was very good.
They brought me a complimentary tasting of the sugarcane juice too... and mine was definitely not too sweet, in fact not quite as sweet as Id expect sugarcane juice to be

It wasnt bad by any means - but a little colder and a touch sweeter would have been great.
The Missus ordered Bihari Kabab, the Daughter ordered "Chicken Tikka Boti" and I had the Frontier Chicken. We also ordered Garlic Naan. Wifey quickly opined that she enjoyed tonights version of the kabab much more than Khan's (which she adores, BTW). I had asked for my chicken to be spicy, and they came through in pretty good style. The dish was both flavorful and plentiful although the bright red color was somewhat off-putting at first. The Daughter enjoyed her chicken as well, although she's used to it being a bit less spicy (they have her order down pat at Khans...). I tasted their dishes (in the interest of science) and was fairly impressed with both.
This is the part that throws me a fair bit, and makes it feel like a different restaurant

I didnt have the dishes you did... the buffet had a chicken curry, a lamb korma, a chicken biryani, a haleem, and tandoori chicken as their non-vegetarian options (they also had about 4 veggie options not counting snacks - including chana-dal, dhokla, and a few others.. I didnt try any of these and so can offer no comment).
First, the good - tandoori chicken was added fresh-ish to the buffet (it doesnt come fresh to your table like at some Devon restaurants) and was decent, flavourful.
All the rest.. well, they werent bad, flavour-wise, but they were all, IMHO, very seriously lacking in heat. Not that these are supposed to be fiery dishes or anything - but they definitely needed much more heat than they had, all of them (it was the one common theme in all the dishes I tried). The chicken biryani, for example, looked very good - I was looking forward to it as I headed to my table - but it was a bit too bland for me (again, not totally lacking in flavour - it had the masalas, the flavours - just no heat whatsoever IMHO). The "gravy" dishes were also somewhat flavourful, but more creamy - no heat there either. The haleem was the real disappointment to me - I really like a good haleem, but this one was completely bland, and didnt even really look like a good haleem (it was sort of white-ish, almost, rather than yellow-ish as good haleem usually is - and good haleem should have a little heat to it too IMHO).
I know the dishes are different from the ones you tried - but my experience was diametrically opposed to yours on the scoville-scale

Khan's chicken-boti can be very hot sometimes (and I never ask them for extra-spicy or anything either)... none of the items I tried at Pakwaan were even remotely hot, not even in the same ballpark in terms of heat. Maybe this is the "buffet" thing - maybe at lunchtime theyre putting out items toned down in heat-level? Otherwise its hard to fathom an explanation for the radical difference (especially since we're comparing heat-levels to the same baseline, that of Khan's).
I'll definitely give Pakwaan a few more tries - it seems like a nice enough place (they are, though, trying to be a lot of things to a lot of different people IMHO - they have the same non-vegetarian list of items as a place like Sabri Nehari or Usmaniya. ie the haleems, neharis, botis, biryanis etc; but they also simultaneously have a very extensive vegetarian menu that those places dont.. and the clientele for the two is very different). They also have a fresh-juice bar which will probably do very well. The next time I plan on trying some of the kababs you mention above - maybe those will be the ones with a little more heat-punch.
c8w