I would also look at...

Does it rail or run wide.
PB and date of PB.
The age of the dog.
Location of previous runs.
Its box position compared to others. ie: a wide runner on the inside of one that likes to rail etc.
The trainer.
Its breeding. A great site for that is greyhound-data.com

Im not sure what data these handicapping systems use, so hopefully you find some of that usefull.