RoboBrew Efficiency

I'm keen to understand if there are any improvements I can be making to my process on the RoboBrew. I purchased the system about 9 months ago and have been tracking my efficiency on the last 5 or so brews. I can't seem to get past 60% total efficiency but I'm achieving good numbers in mash efficiency. System is as follows:

Keg King RoboBrew
Magnetic Pump and recirc hoses
Stock pot on the stove for sparge water

I've watched Gash's videos and I'm following the same process with the exception of sparge in that I don't use a strainer and simply pour from the jug into the malt pipe. I've recently started looking into mash chemistry and found my local water profile. I brewed a Smurto's Golden Ale today and added Gypsum, Epsom and Chalk to match the water profile I was after but sadly that did not help efficiency. I'm still hopeful it will improve taste and accentuate hop flavour but my total efficiency was 58% today. I nailed the Mash Gravity at 1.035 and 72% but missed OG of 1.042 and instead came up with 1.039 at the end of the boil. I had found on previous brews that I was coming up with too much wort at the end but today I adjusted and ended up with 19.95L against a target of 20L. A screenshot of my numbers below.



My steps are as follows:

1. Night before, set up system and measure out water - leave overnight for chlorine to dissipate. I've downloaded the Beersmith RoboBrew profile from this forum
2. Morning of, add salt additions to mash water and begin heating
3. Once at strike temp add grain and let sit for 10min
4. After 10min start recirculation - I clamp the hose to the inner wall of the malt pip and control the flow so that in runs down the wall and not directly into the grain bed
5. I stir the grain relatively vigorously at least twice during the mash leaving at least 15min of rest at the end to help clear the wort
6. When I raise the malt pipe I begin sparging with the heated water once the level of wort has dropped below the top of the grain bed - I let this drain until I've reached the boil volume
7. I take my pre-boil reading now after stirring the wort to ensure the reading is accurate - I use a refractometer and sometimes hydrometer if the reading is off
8. During the boil I try not to cover the kettle for consistent boil off rate.
9. I use hop balls or a hop spider for additions

Any insights as to how I can improve my efficiency would be most welcome.

Cheers

File attached.

I ended up with 19.5L in the fermenter but I took a hydro sample of 250ml to ensure my refractomer wasn't lying to me and there was 3.2L left in the kettle when I emptied and I accounted for 3L of dead space when measuring water. hence the 19.95L.

Ok, so I do use a 20m extension lead (only one I have) into a powerboard to run the Robo and the pump. It does make sense that this would be affecting the boil off rate. I'm based on the southern end of the Gold Coast also.

So - what is the adjustment I should make? Lower the boil off rate in the equipment profile? I'll brew the same recipe this weekend.

I'd be happy to hit just 65% consistently - that way I can plan ingredients around that number.

BTW - I added gypsum, epsom and magnesium to the mash water before heating, but did nothing to my sparge water - should I be making similar additions?