What power supply do you recommend for SO2R operations

What do you mean by disagreements ? The RS-35 should be fine for what you are doing. I use the Astron RS-50M. More than enough current to run multiple radios and accessories. It also runs a little cooler during long contests. I never pay attention to the meters. You can save some $$ and go with RS-50A.

Who is the manufacturer of that power supply ? Astron makes very good highly reliable power supplies.

I use a pair of RS-35A’s. One powers only the radio (6600). The other runs various shack accessories (HF-Auto, antenna switch etc.). I have had both for years and have not had a problem with either of them except for the incandescent meter lights burning out (replaced with blue leds). While I often run digital modes, I do not do any digital contesting. I do run a little casual cw contesting and a lot of serious phone contesting and they have kept up without issue. Does yours run more than just the rig? It’s always possible yours had/has a marginal component in it that isn’t up to the stress imposed by extended digital contesting. It might be worth a call to Astron. I’ve always found them to be very helpful and pleasant to deal with.