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I am not 100% certain however this looks similar to an issue we get in a quart finish. The actual cause is the coating has partially dried out and still been being worked (here). These are very mild compared to the ones we see. Easiest is to live with them.

How long have these spots been there? Since new? Or was the pool emptied to help with landscaping?

Sorry. I read the initial issue as pump 2 was pulling the water away from the pool jets. Adjusting the valve will likely solve this issue. I am actually a fan of putting the pump before the filter for other reasons. However it means upsizing the filter as the flow combined will be above the...

I have read up on this technique in use in USA, and am a little surprised by it. I understand the logic but think it could be done with water in the pool.

With pump 2 off. Take a pressure reading on the gauge at the filter with pump 1 running. Adjust the valve I have circled in pink so the pressure gauge moves up a smidgen in my language we would look for 10 kPa increase. This gives a positive flow to pump 2. Now start pump 2. Has this...

Not the best practice to plumb two different pumps together. However it can be done. It wont result in 2.5 hp. It will result in something else. At a guess 1.9 hp or similar. Effectively the smaller pump will have to overcome the 'pressure' of the larger pump to get its water out and this...