My recent toy is a king cock ultra realistic dildo which is also compatible for strap on, maybe give one of their products a try if not already as they do feel great once in!
I’ll +1 for the 8 inch king cock strap on kit. The dildo that comes in the kit is 6 inch in girth and really gives a great sensation of fullness / stretch. We do have to be a bit gentler with movements, I also have the 6 1/2 inch king cock dildo that is about 5 and a bit inches girth, much easier to take and can be used a bit more vigorously.
Since you mentioned your not a beginner, I think you will like these dildo’s
One of my favourites is the Doc Johnson Bam/Hung Vac-U-Lock dildo which also can be attached to the DJ strap on harness. With 8.5 inches in girth it gives an awesome stretch and a wonderful feeling of fullness.
It is also has 10 inches of insertable lenght so it quite long but we’re still working on that. Getting pegged with this one is really intense.
Besides the bam/hung my favourite is DJ American Bombshell Big Boy/Crystal Jellies. With 7.5 inches of girth it still gives a awesome stretch and full feeling. I really like it because it is quite smooth so you won’t get sore, my wife can do me quite long, hard and deep with this one.