Yeah, I think you're fine doing deads 3x a week -- as long as the weight is "light" (as you put it) and you're recovering well (which I'm sure you're experienced enough to guage for yourself).
In the beginning, learning form is more important than how much you pull. You should be going into each deadlift session with the mindset that you're there to practice your technique. You're trying to "grease the groove" as it's commonly said. You seem to already know this, so kudos to you for that. Generally speaking, when you're trying to get better (more skilled) at something, the more practice the better -- so like I said, as long as you're recovering well, keep at it!
As for me, I only deadlift once every 7-10 days. I deadlift very heavy (for me) on that one day and that's it. The rest of the week is spent working out in other ways.
Btw, congrats on the 185 for 2x5! That's well over your BW correct? Not bad at all for 5 straight reps. Seems you're progressing quickly!