I picked up a vacuum gauge and a pressure gauge and hooked them up to the pump ports and got the following readings. I'm just not sure my vacuum readings are accurate, as they seem extremely low. Plumbing is 2.5" suction and 2" returns. Pool / Spa combo. Do these seem reasonable?

Pool/SPA Mode

3450 RPM = 4 in hg / 17 PSI (TDH 43.79 after 1.13 / 2.31 multipliers)

3000 RPM = 3 in hg / 14 PSI (TDH 35.73 after 1.13 / 2.31 multipliers)

2400 RPM = 1 in hg / 9 PSI (TDH 21.92 after 1.13 / 2.31 multipliers)

1725 RPM = 0 in hg / 5 PSI (TDH 11.55 after 1.13 / 2.31 multipliers)

SPA ONLY Mode

3450 RPM = 4 in hg / 23 PSI (TDH 57.65 after 1.13 / 2.31 multipliers)

3000 RPM = 3 in hg / 18 PSI (TDH 44.97 after 1.13 / 2.31 multipliers)

2400 RPM = 1 in hg / 12 PSI (TDH 28.85 after 1.13 / 2.31 multipliers)

1725 RPM = 0 in hg / 6 PSI (TDH 13.86 after 1.13 / 2.31 multipliers)

Thanks for any info!