Keith, use the bladder tank and put it on the CG, you'll be fine. Jett tanks aren't bad on the price but the cost of memebership (the syringe) is a bit high. You could go to the feed store and get a syringe from them to see if you're going to like it (some hobby shops sell them too).

The only concern you'll have is that since it's now over the wing it's going to be higher than your carb and with an RE you'll have to make sure you have the room to run the exhaust out over the tank.

Tim