I think this is fine for Giant 1.0.
Are you resting enough between sets?
Even if you are doing a set every 3 or 4 minutes (or even 5 at first), that's still plenty of overall volume, and not out of line, depending on:
1. How comfortable a 10RM you are using. Some people will even try it with an 8RM, which can work, but just would require more rest and result in lower total volume.
2. Your individual work capacity at a given moment, which is a trainable adaptation, but also depends on your overall training load and your recovery from it. If you haven't done sets of more than 3 for the past 4 weeks on 3.0, sets of 6 will require a bit of acclimation.
3. Whether you're wired more for low rep strength or more for strength endurance, which is more of natural disposition.