Very nice! I am glad my guide helped you get started.
I too discovered how good Jilly is as a starting Main tower. As an added bonus, shes the only real usable carry that can use the Handbag! When you transform items early on, thats the item you almost always wind up with.
I would tell you to try one other approach. Instead of using Shadows for all your other slots with Withered set, try using all Jillies! With 500 rounds and lots of keys, they will all be pretty high level. Giving them a good 5-9% of a kill for every shot. With 0.1 Attack speed, they fire a LOT! You can use the shared pots strategy OR equip with the Haste set which adds huge attack speed boost easily.
This basically shreds everything on the bonus round EXCEPT for primary boss types. As such you don't really need area of effect stuff anymore. A Knusper up front kills a lot of the mass creeps already and provides huge armor debuff.
So your Biofield doesnt have to shoot near as often and doesn't fall off as fast. An Iron with the Withered main set debuffs the bosses and knocks them back.
I managed to get 6700 seconds and Chuck Norris rating on Medium with this approach.