Nope, the slow one is the softer tip from Moori. Howewer, it's harder than a soft "non-layered" tip. Personally I've never tried the slow but the medium and Quick are very good tips.
The Z shaft are good, but I will not recommend it for the beginners (I'don't know how is your speed...). A thicker shaft is much easy to play and provide more consistancy and margin of error in the stroke... JMO.