Here is an interesting way of selectively betting top weighted horses in handicaps.

1. This betting system operates on metropolitan meetings in Sydney, Melbourne, Brisbane and Adelaide on Saturdays.

2. The horse must be top weight in a handicap. So eliminate weight for age races, classic races, set weight races and set weight with penalties races.

3. The horse must have won over the track and distance.

4. It must have finished 1st, 2nd, 3rd, or 4th. at its last run within the last 28 days.

That's it.

I checked last Saturday's Doomben races.

There were two bets:

Spot The Diff 1st. $2.35
Casual Choice 1st. $7.00

Here are Saturday's selections.

Caulfield
8/1 Charmed Harmony

Morphettville
1/1 Excites Zelady
4/1 Beautiful Flyer

Selection for Saturday, 23rd. April.

Morphettville
3/1 Silent Whisper

Moonee Valley, 26 Nov, R3 Estaminet

Morphettville, 26 Nov, R5 Casino Wizard

I have a top weight system but differs from what you have identified.
It hums along and always surprises me that it picks so many big price winners.
It is based on the simple idea that the handicapper knows a lot more about horse racing than I ever will.

And yes I use a few filters but these mainly relate to states and tracks as I have indicated before. It also filters out my voodoo tracks.

Star Exhibit would have qualified if Ascot included,,won,,26 Nov

Canterbury, 9 Dec, R2 Black On Gold

Rosehill, 10 Dec, R4 Alart

Morphettville, 17 Dec, R3 Pepper the Pin