Give it a few consistently profitable weeks to get a true picture though, they all start off fine and then seem to deteroriate once that honeymoon period is over.
It may just be my paranoia, but I have noticed the same type phenomenon. I'm still making it alright and all with the profits, but I have noticed the same things you mentioned for myself. I didn't think much of it til I read your post. Too bad there's really no one better than Oanda. They're still working out good for me, but I'll definitely be paying more attention to make sure I'm not going crazy or having some sort of confirmation bias.