I must say I found funny to see someone else has exactly the same thoughts about the Dato in Pt: it's a great piece but totally uncomfortable on my small wrist too (weight+shape).
The new Dato, in spite of its rise in size, doesn't seem to solve the problem (even though I didn't try it long enough to be sure).
This 1815 chrono is certainly a great chrono ALS on its own, congratulations Mike.
Cheers,
Mark