Ive recently heard rally 2 wheels are lug centric but I have had a few sets of rally 2 wheels on cars over the years & none were balanced with the lug centric adapter and have never had a problem balancing them. Unlike honeycombs that have a very thin/weak center hole area, rally 2 have much thicker metal around the center hole that allows them to be mounted on the machine very straight with the normal cone adapter... providing the tech gets them mounted squarely on the machine, can even do a spin without the tire to check for out of round or run out.
For the weights I always have them do a full dynamic balance (weights on front & rear of wheel), not static balance with weights on just the back side, although static has worked in the past as well. For nice wheels that your dont want weights showing on the front, you can have them use tape weights on the inside of the wheel but placed towards the front edge. Have a set of rally 2 on one of my cars that were not lug centric balanced, standard dynamic balance with tape weights on inner front & clamp on weights on the rear outer... the tires/car drives great with zero balance/vibration issues at 35mph or up to 80-90mph on the interstate or back country roads. Lug centric is best if you can find a shop that can do it, but for rally 2 wheels, they can definitely be balanced for a smooth ride using the standard cone adapter if the shop/tech knows what they are doing & has a good balancer, in my experience.
Tires can also play a role in balancing or ride quality, some tires are much harder to get balanced than others. As a last resort you can find a shop that does road force balancing, where they put a load on the tire while balancing, much more expensive though.
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