That is a small tire, you likely should just stick with what you have.
I used the plastic beads in some 37x12.5x15 Iroks I ran and that was ok. They are noisy however when you slow down for a stop, the centrifugal forces goes away and I could clearly hear them fall every time I stopped. Guess a loud stereo would fix that.
5oz really is not a big deal, if they are running smooth you should just keep what you have. You might want to consider stick on weights, I have not used the lip weights in years.
I lose a lot of the stick-ons, though. People on the freeway behind me are probably like, "What the hell just hit the front of my car!?" A half-strip of weights has got to do some damage.
Hmm how exactly do they work? It would seem that they would migrate to the heavy part of the tire, I don't get it?
Basically, as the tire spins and the "heavy part" moves to the top of its rotation it pulls the tire upwards very minimally (centrifugal force). The beads move in the opposite
direction because the are "floating" around in the tire's air-space and not, mechanically, attached to the tire. They will pin to the inside walls with centrifugal force, but, are not constrained to that location within the tire permanently. They will, still, try to react against an opposing force of vibration (Newton's Third Law). For example, if you were to hold a half-full bottle of water in front of you steadily, and then jerk your hand, rapidly, downwards. The water, now, "moves" to the top of the bottle.
Neat demonstration video of beads in action:
In the 1970's you could buy bead balance rings that mounted to the inside lip of the wheel - out of sight. I bought some from J.C. Whitney and put them on my 72 El Camino. They were great - quite and perfectly balanced. I never could figure out how they worked, but they did. I haven't seen anything like them since then.
I didn't know you could use the same principle by placing beads inside the tire. I like that idea, but how do you know how many beads to put inside the tire?
Those rings worked like fluidampers for your engine. There was a type of viscous liquid inside the rings which mimicked what the bead-balancing does.
The manufacturer of the beads often provide a chart on how many ounces you should add, to each tire, for each tire size available.
From what I've been reading, "ceramic-compound" beads are the best because they don't break apart like pure ceramic and they don't clump together when wet like plastic. Nor will they damage your rims like metal. However, I started this thread because I want to know if anyone's first-hand experience is different than what I've read.