Good servo value? Look at Hitec.

As for the choice between moving the battery and adding lead..... If you add lead, you have to secure it safely right. And tails often aren't exactly strengthened in the off chance they might see 3ounces of stuff in one very small spot. So...... If you're going to have to do a couple of minutes work adding the lead, why not take that couple of minutes and move the battery pack instead. It won't take much more time than adding the lead.

As for your 65 being much of a "more powerful engine than recommended" it isn't. It's roughly a 40 two-cycle in power. It's just about exactly what the plane was designed for. Taking a couple of minutes when assembling an ARF pays you back every minute the airplane is in the air. And that sucker ought to last far more than a couple of minutes. So the time to move the battery is going to pay off way more than the little time it takes to do. And the engine really will benefit from a lighter load. It isn't overpowering that sucker one bit.

I used Hitecs in my two Ultrasticks. Just about wore one of them out and sold it. Servos still working perfectly. Blasted the new one into kindling almost right away and that stripped a couple of brand new servos. Good values can still be trashed if you're unlucky. Think the replacement gearsets were $4 or $5 and WERE AVAILABLE. Hitecs are very popular.