Is SEN just getting standard grooving or will the runway be certified 'WSR'. Only a damp standard grooved runway can be considered dry for purposes of calculations. But WSR is a different beast and is prob required to keep the show on the road when the rain comes.
RYR quite happily operate in and out of Dortmund which has a LDA of 1700m, prob the shortest LDA in the existing network. But it has certification for WSR which makes a big difference.
The shortest I've operated quite a bit in to is in the region of 1800m and yes when wet and full pax its quite limiting in how much extra fuel one can have so 1600 is gonna be fun, especially combined with narrow runway ops!