-20s/100m with wetsuit?

Hi folks,

I did my first Oly yesterday.  Great experience - I've done one sprint a month ago and enjoyed the longer distance.  Next race up is an Oly in 5 weeks.

I got a brand new wetsuit - Xterra Vortex 3 and this race was the first time I wore it (3rd OWS ever).  I swam 1:40/100m for a time of ~25:00 over 1500m.

THE PROBLEM:  a month ago I did an OWS race, 1500m in 33:00.  In the pool, recently, I generally do 1500m in about 30min, or 2:00/100m.  Would this wetsuit really make such a difference as to shave 20sec/100m?

Theories:
1) The course was measured short.  However, i was FOP in the swim (14/162 out of the water) this race.  In my sprint/other OLY swim (on a team) I was bang on in the MOP, so regardless if the swim was short, I significantly improved in my OA standing.
2) My pool swims are abysmal - I don't do flip turns and am quite slow (but not 20sec slow) at turning at the end of my lengths
3) I have incredibly bad form which the wetsuit drastically improves - and actually have a stronger stroke (for me) than I thought.

Theories?  I guess I'll always find out in 5 weeks if I bang out another performance (or not) like this.

Thanks!