Seems a bit long, I assume you have timed it as you give a value.
Is 70 from the start of the fast slew or from when? Just to get an idea of the detail.
Whichever it seems long.
If from start of slew then check the Max Slew Rate, may be lowish to reduce noise. Just thinking it could be at say 5 or 6 and 8 could improve.
Unsure of the detail of the centering action. But the Meades I have met usually take around 15-20 seconds - 70mm to 14" Meades. The fine end bit being quite small say 5-8 seconds.
There is a crazy option: Slew rate is set low, scope predicts how long to slew for at full speed, slews for that time but as slew is set to slow is say half way there, then completes at the slow fine rate hence taking a long time.
As said crazy but ???