I think it is a good idea, from what you're saying.
If you love to play an aggressive third ball and you're not yet Ma Lin/Long, you'll welcome the control from a slightly slower blade. We're really talking OFF-/OFF here, so it is still plenty fast anyway. If your loop uses the full arm motion, body weight and wrist, you probably don't lack power. OFF+ might just be too fast and hamper your game.
The point for me is to understand which shots I can loopkill, which ones are trickier, and the balls that I have yet to practice more. I don't want my blade to be in the way of progress. I want a blade that makes me confident about the shots I can do as I need a good attitude in games, and also during practice.
Yes, it felt average, roughly how I wanted it to be in fact. I don't have a good perception of what people call dwell, maybe because I'm used to hard rubber (I'm fond of H3N). The closest experience I'd describe as "longer dwell time" is when using softer rubber sheets, or springy tensor rubber where you can really feel the ball sink in. I kind of like the feeling, but the heavy nonlinear behaviour of some tensor rubbers negatively affects my game. Among soft rubbers for which I have good feeling, I couldn't get close to H3N in terms of comfort and spin on serves. My loops also seemed to lose a bit of "humpf" (spin/speed/effectiveness).
As for blades when using H3N, my feel for it is that the dwell time is roughly proportional to how slow the blade is.
If by chance you can try out a few blades for free (clubmates?), don't shy away from the occasion. See how comfortable you feel serving, receiving and holding your ground close to the table. We probably all put too much emphasis on blades and rubber, but at the very least a bat shouldn't get in the way of progress by being too unforgiving.