Just curious how you are determining what is 65% of your max lift? Perhaps you are not using enough weight?
p.s. Phase 1 changes in week 3 to 80% your max lift and 5 days per week. The first two weeks are designed to prep your muscles for heavy lifting- and maybe give you a little confidence booster. If you feel really strongly that its too easy and you're sure you're already lifting 65% of your absolute maximum (the heaviest weight you can use and do the lift with good form ONCE, but not twice), then perhaps jumping to week 3 would feel right for you.
I think IAMSHE-RA had good workout base before she started and a few more people (like me) have repeated the program after other workouts or a break. Frankly, after not lifting for 6-8 weeks, it felt hard enough to be pushing 65% of my max for only 30-40 minutes a day during that first week.
And if you've been working really hard on some other workout program for several weeks or more, then maybe a little light week would be good for muscle recovery. You've got 11 more weeks to push through with little rest (once an week for phases 2 & 3) and I've seen plenty of people burn out mid-way.
So, three choices:
a) Lift heavier, b) enjoy it while you can, or c) skip a week ahead (which also means lifting heavier).