I’m the furthest thing from a credible authority but, I dont think it is our job to focus on these things. Daven how you seem fit. Say Tehillim, if thats how you communicate, read the english, whatever. Hash-m knows whats right for you and He will give it to you in the right time not a second before and not a second after.
I think maybe this teachers lesson was taken out of context (hopefully, this was the case) if you think that you can C’V “trick” Hash-m into giving us things, lest we forget who is actually runing the world.