In general, you'll get a lot more from the V-type (or another good suit) than you're getting out of the z suit, especially if its too big. lol. I have a training partner that recently switched from a z suit (or maybe it was a champion. I don't know. They're both just thick singlets to me) to a tight Titan suit and she had huge PRs at her last meet.
I've heard of flipping the suit backwards, but still don't get it. If anyone can explain that, it would be appreciated.
And, I wasn't doubting your strength, but there are people on here that seem to think that PL gear is a quick way to get strong...just felt the need to clarify. I'm all about getting the best gear you can use.
Check the "Suits and Briefs" gear guide at the top of the forum for more gear reviews.