Hi bro, regarding your questions to change program.
I don't think it will make much difference as both of the program are very similar.
There are some better program that you can switch to though.
One thing about SL that I don't like is that it focus too much on lower body so I switched to Phrak's GSLP but Ivysaur program looks pretty fun too.

Ah, yeah, I had that too, if you want to balance it out you gotta add some accessories for upper body at the end of your session.
ANW, this thread might be helpful for you, cheer
https://www.reddit.com/r/Fitness/comments/4...lifts_starting/

As you might've read on my journal, I started out with SL 5*5.
At first it was ok when the weights is still light but as it gets heavier, I tend to spend more time resting.
This makes the whole session lasting longer than it should and I have no time to add in any accessories exercises if I wanted to.
I didn't really make any gain on my upper body and my friends only started to notice my bicep getting bigger when I switched to GSLP.
It's a more balanced program IMO.
You will really start to hate squat when the weight gets heavier.