Boggle and YAWL

I've been using the TWL06 (Scrabble) list. This is fine, but it only includes words up to 15 letters in length. For Boggle this is a minor problem, as it's possible to have 16-, or even 17-letter words if you use the "Qu". So I've switched over to the YAWL word list and started a new billion-board run using the 1992 4x4 Boggle cube set. This is perhaps a bit of second-hard paranoia, as my first billion-board run only found a single board with a 15-letter word - "intergradations".

After 500 million boards, the densest board was:

nslo
eiae
drts
eash

This includes 862 YAWL words.

The board with the highest standard (2311), house (2664) and Fibonacci (3784) scores:

dsti
laee
minr
dest