There are LOTS of performance upgrades you can do. To me it sounds like your variator weights are just different from your first tao. Try buying a 16x13 variator weight tuning kit and figuring out which weight setup works for you. Then replace the variator roller weights with Dr. Pulley slider weights 1g higher than the weight you've selected as your favorite.
http://www.scooterworks.com/prima-ro...p#.UcZBVk1jjcc
Next you will need a new torque spring, and without the proper tools you will need to have that professionally installed. 1.5k should have you tackling those hills.
Your takeoff acceleration can be fixed with new clutch springs. depending on what rpm you'd like to go when taking off off the line you will want either 1k, 1.5k, or 2k clutch springs. You will not lose topend, but you may lose your lower end speeds due to the higher rpms which your clutch engages.
You may need to derestrict your exhaust, carburetor, variator, and even air box if there are any restrictions.
Hope this helps...