I own a 2009 stratos 285xl. Had a 23m prop on it that was stock, not in perfect condition but still works. Runs at 5700 rpm and about 52-54 mph. I just recently purchased a brand new tempest plus 23 p prop. I tried it out today and found that the boat was running weird. The tachometer would jump back and forth and I could only hit about 5200 rpm at best. The boat almost felt like it was missing at times. I know it’s strictly due to the new prop but what I was experiencing considered prop slip? I don’t have a jackplate either. Thanks in advance.