as for tonguing it’s really personal preference and the way you want to articulate it to get it across.
As for the high F, could be either or a combination… I would try it on a few different reeds to see it it happens all the time then I’d know. Also, try cominmg down to the E right after you paly the high F. If it doesn’t squeek then work from there. trying to make the progression to the F without squeeking.