Fly fishing the yough

So I might possibly be planning a trip to the yough this year to fly fish, but I dont know if I really have the gear necessary. I have a 8 foot 4 weight and a 9 foot 6 inch 7 weight, now I think the four weight is probably to small and the 7 weight to big. What would be the ideal weight and length for the yough and other large rivers like it? I was thinking a 5 weight that's 9 or 10 foot long, and is that 1 foot that big of a difference? Also what do you normally fish a river like that with? I normally fish creeks and I am at a complete loss of knowledge when it comes to the yough. If you could shoot me a pm with some help that would be awesome, also I will be searching the forum for older posts about the yough, thanks in advance too.

rod size is relevant to what you are casting...  if tossing adams/dropper the 4 is perfect.  if throwing meat, bring the 7.

If/when you hook into a nice smallie and it runs into the riffles, a 4 wt. will offer very little control for getting it back out and bringing it to hand.

There is often a pretty strong wind blowing down the river too, and if you don't have a wicked tight and powerful loop to cut through it, a 4wt. line may collapse part way through.

For those reasons I would err on the side of caution and use a 6 or 7 wt.

I use my 7ft 6 4wt on the yough, it handles the average fish ok but anything bigger an it gets a lil tricky and interesting, 2 occasions last year i hooked nice fish where the bottom release is and i couldnt get them outta the current there resulting in a break off, i'm thinking of getting a 6wt when i have money.

Ronnie