When to start GOMAD with the 5x5?

[tweak]

I've been reading a LOT from this site. When I first took a look, I was 5'9" 155 lb (~82 cm, 70.5 kg if my math doesn't suck) and I could squat 225 lb one set, 5 reps on Rippetoe's SS program. However, I found out how bad my form was, and how most of it was due to a lack of mobility. I abandoned my program to focus on stretching.

Since the Stronglifts 5x5 starts with the bar, at what point should I add in the GOMAD? I see a lot of people who said they gained more fat and less muscle than they expected say it was because they weren't doing enough weight (or skipping workouts which isn't an issue for me). Do I wait until the weight is getting near my 5x5 max? I like the idea of starting light though... I want to make sure my back doesn't round during squats.

[lovestolift]

I think you are probably better to wait until the weights get a bit heavier. There will be more of a stimulus with heavier weights, thus utilizing the calories for muscle instead of fat.

[joesterizer]

A good rule of thumb for people who are not terrifyingly underweight might be to wait until you start to stall. That ensures you will be lifting enough, and will give you a huge calorie boost which could help you push through to even bigger lifts. It's working well for me so far, I've gained 10lbs in 8 days, and increased my squat by 10lbs.

If you want to gain the weight sooner, that would be ok as well, but be prepared to get some chub. Despite my harder lifts, I am developing the notorious "milk-belly"