I have a New redington 7 wt 2 handed rod. I got in the mail 4 lines to try?? all are scandi lines. 480,510,540 gr and a steelhead scandi 520 gr. So what would be the best way to test all the lines in the same tru life specs?? Thinking of using the same poly leader and fly and head down to the water and cast about 1/2 hr with each line. Sound about right??