It looks like the durso was already set to the correct height. I think you should be fine to go ahead and fire up the system to see how well it works.
Great pump choice. I run two of those on my 220. I recommend getting another one to replace the one that got damaged. It’s best to run two pumps for refundancy. I would start the pumps at 50% each, or 100% for the one right now.
Can you clarify the size of your drains and your returns. You said they are both 1”, but they are definitely different sizes in the picture.