Staying on Phase 1 after 4 weeks

Currently completed UltraMetabolism week 6 Currently doing UltraMetabolism

Not yet begun the UltraSimple Diet Not yet begun the UltraSimple Diet

I have lost 4 poounds on Phase 1 of the Ultra Metabolism diet and I'm about to move to Phase 2. If I'm comfortable with the foods and recipes on Phase 1 should I stay on it longer rather than moving to Phase 2? Even though I haven't lost many pounds, I've lost almost 2 inches off my waist and hips.