The skirt gives me -6 on crush, still at +96 and with slayer mask, well, didn't seem to matter a lot but you're right of course. I also stayed after my prayer was finished, feeding on raw fish with bunyip scrolls, depends on your luck but it gave me another 20 kills, i still had super att and str cause i drink them a bit slower then mentioned. I also used godsword. Not saying all this is best practise, just saying what I did :)