The Dorset Stour (and definitely not just Throop) still offers reasonable opportunities for a 7. The Hants Avon is currently probably a few steps ahead of the Stour in that regard. I've never had a 7 from the Avon, witnessed a few, and come close a couple of times. There again I tend to concentrate on the Stour and fully acknowledge I would need to spend far more time on that other river to improve my chances. Talk of 8's, particularly on Throop is, in my view, a very big leap. But it's a possibility.
Prior to relocating back to Dorset in 2015 I had been fortunate to have quite a number of 6's and a few 7's from the Stour. All the 7's came from Throop and had been caught on the Black Cap feeder allied to an insanely short hook link. Generous locals had shared their methods and skills with me which was a fabulous short cut.
Around 2011 I decided to concentrate on trotting for these leviathan chub. Plenty of 6's arrived but I had to wait till 2012 to get my first 7 on the float, again from Throop. I had 3 x 6's to 6:13 plus that 7:03 all on the same afternoon. The 6oz difference was huge! Between 2012 and 2015 I had 5 7's, 3 from Throop, topped by a 7:08.
I became a local again just before the 2015/16 season started and fished the Stour an awful lot in the late Autumn into Winter 2015/16. Lots of 6's with a few between 6:10 & 6:14, then a 7:11 arrived a few days before the season ended. Again that was the mega star of the show on the day the big chub really went into overdrive. I've had 3 more 7s in the last 7 years. My own overall tally of big 6's has fallen in each of those 7 years but each late season has produced a few to 6:14. My last 4 trips of last season produced 8 6's to 6:14. (my winters now usually include a fair bit of grayling fishing on the Dorset Frome as well).
Here's an image of the 7:11 from March 2016 which remains my PB.
View attachment 22764