Paste is very heavy off center
I spent some time with the TR people a couple of years ago and I think they are some of the best in the biz. I do not have that heat sink in house so have had not a close look at it.
So hard for me to second guess their designs and and how they line up with our paste.
The contact area is narrow but pressure will be high in area of contact so a 50 lb mount might yield 100 psi + in the contact area a big plus as far as any thermal compound goes.
But there will also a trade off with the diminished contact area, as to how much I can not say.
The two pole/point mount do sometimes come with a bias on one side or the other as I have seen in some water blocks.
I do some heat sink/thermosyphon design and generally find copper base should be .160 - .180 thick to adequately spread the heat, like I said from the pictures hard to tell but from the contact I would be worried about the heat spreading to the outside heat pipes.
For instance I can not test a heat pipe cooler on a one centimeter die as the heat will not flow to the outer pipes and will give a poor performance reading. On a 1 inch die they test very well, the design intent obviously is for a larger contact .
My own experience tells me that the more contact the better and I have seen recent contact/ pressure paper snapshots of similar result that when lapped improved the thermal performance.
Like I said the TR guys are good and have a different perspective if I had to speculate I would say the real reason they bowed the mount was to try and compensate for IHS contact irregularities, I think the Intel spec is Flat & // to within .002 but in that range you find IHS's with peak in the middle or a island in the lake with peaks in the middle and edges or some that are shaped like cup with higher edges all the way around and a depressed interior area.
These kind of contours are fine for the Joe six pack kind of computing guy they just gap it with the design intent of thermal compound.
For the more rarefied performance user getting everybody on the same page with these kind of contours as few go through the effort of lapping this may be a TR's stab at it.
So to answer your question - as a guess you will see -2 to -4 C if you get it balanced right and are not hung up on the edges - your pressure is great as the contact area is light but shows the paste as a thin layer having resolved down to the average particle size/thickness - and of course depends on the previous compound applied and applied power.
The contact images below show the variation in IHS/Sink contact for typical endusers
Some hang on the edges, the middle or both, some are balanced to one side or the other.
And some, just a couple have all around both great contact and pressure
