RE: G5 Peep sight???
If your current peep isn't coming around fully, switching to a G5 isn't going to magically fix the issue.
Here are a couple options;
1.) If you currently shoot with a D-loop, have a new one tied on better than the one you currently have.
2.) If you don't shoot with a D-loop, have one tied on properly.
3.) Take your bow into a shop and have them put one half twist in your string in the direction that the peep needs to be rotated more towards. You may need to have your loop re-tied or adjusted after this.
4.) Purchase a peep aligner and shoot with tubing.
You can definitely switch to a G5 peep, but it isn't going to fix the issue you're currently having.
(This has all been said assuming you're currently shooting a peep that splits your string in two, not into thirds. If this isn't the case, a G5 peep may fix the issue.)