...offer/offering your/our private prayers.

When we see the Dai-Gohonzon at the Head Temple, let us report our shakubuku efforts to the Dai-Gohonzon as well as offer your private prayers. [This sentence is from a Nichiren Shu Buddhist magazine.]

1. Should it be offering instead of offer?
2. Should it be our private prayers since let us is used earlier in the sentence?

Thanks.