My loop is small potatoes, 350 feet, up 60 feet, compared to yours. It is fed with home brew ladder line to a 4:1 current balun then 15 feet RG8X to tuner in shack. Rig is 100 watts. I worked Ducie Island (confirmed on LoTW) on 10m, 12m, 15m, 17m, 20m, 30m, 40m, and 80m with one antenna, the loop, and 100W on CW. Best confirmed DX so far on 40m is VK9XT, 10,588 miles from my QTH. I'd say use your 1,000-foot loop for a few months and get some data on how it performs.