Best day ever and the fish factor

I'm back from 2 weeks holiday and a fresh start is always good for my game, so I had my best poker day ever yesterday, winning close to 20 buy-ins. Really happy with the timing of that day.
The bad news is that I probably have to cancel my Vegas trip due to some problems with the health of the father of my friend who's travelling with me.

Something else I was looking at was a way to find out how good the tables have been over a period of time and how this develops over time, some kind of fish factor.
What I did was looking at 3 things during a month:
1. How much hands did the fish play at my games (VPIP 32+)?
2. How much unique fish players were there during the month?
3. How much did they loose?

The first thing I noticed is that those players keep losing at a steady rate of 30bb/100. That doesn't change much over time, so in other words, the bad players don't get any better.

And for every hand that I play, I play around 0,6 hands with a fish at the table. So that means of I'm playing 12 tables there only around 7 to 8 bad players on those tables (out of 60 players in total). The bad thing is that this seems to be declining. Where I had around 0.7 at the end of 2009 it's was 0,4 in april.

This last conclusion also shows up when you look at unique players. Where I had over 1000 at my tables in September, I had just 500 in April.
The amount they play (80 hands per person) and lose ($100 per person per month) doesnt change much though.
The data I studied is only since september (older data is on my old computer), so it might just be normal seasonal effects (they play more in the winter then in the spring), but I try to keep an eye on this and see how it develops.

Another conclusion you can take from this data, is that if 5,4 players are battling for 0,6 players who are losing 30bb/100, the average winning player will win around 3bb/100. So if you win less then 3bb/100 you're probably not winning from other regulars.

One last other thing, since I'm back from holiday I noticed that Holdem Manager imported some duplicate hands. Somebody else ever had this? It destroys the reliability of my data so I hope I can fix this.