Shaun, may I ask which ones are causing you trouble or are going to cause you trouble as I use a varied version of your spreadsheet.

I'd suggest using the racingaustralia form as its unlikely to change to my knowledge and you can either scrape recent form (last 5 starts) or all form. Scraping all form can be a hassle for large meetings as its about 5000 lines of data but I haven't found that it slows excel at all and its pretty easy to scrape what you need (prizemoney, number of starts, settling positions etc etc.)

One thing I would caution that I recently found out is that if your recording any stats post-race, depending on how quickly their website updates it can sometimes contain the race from that day - just something to be mindful of.