We can't see your keyword competition, but be aware it will be hard to keep good rankings with GSA links only on long term basis. You will probably need some high authority, high PR links.
If your strategy really only include GSA you can try to diversify your lists some more and build extra campaigns of higher quality tier 1 with blasts in tier 2. Might work for you.
Is a rapid indexing service really advisable today? I've seen more negative than positive come from those and simply using Webmaster tools to force a crawl seems sufficient.
Just carry on with what you do and try building further tiers to your existing links. Normally though, I would recommend creating tier 1 on reliable properties that would last long, while using GSA on tiers2 and above.
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