On my Pro-Line eight shooters, I bought them from a guy that crawls and wins a lot of comps, he's a sponsored crawler. He was running a very smililar 2.2 setup to what I'm running, so I left them how he had them set up and they've done pretty good. I have twelve 1/4 ounce (7 gram) weights on each front wheel, and none in the rear wheels. They are the stick on weights, and I use pro-line memory foam.
However, my new wheels (all aluminum MSD beadlocks) are a lot heavier, so I'm going to add some weight to the front wheels but that's it. I would try the setup like I have, and if you want to put some weights in the back, put either 2 or 4 weights on each back wheel. You always want to have more weight in the front, which helps with vertical climbs and break over ledges and such.
I only run maxamps.com, because I haven't found any other battery supply places that have the level of customer service that maxamps has, and they really know their batteries. If you're looking for nimh, they can build them or you can go with a TCS saddle pack.
http://www.tcscrawlers.com/TCS-Craw...corpion-9.6-volt-Deans-Connector-p-16620.html
I definitely reccomend the LiPo from maxamps.com, it's all I run. This is a very helpful site for battery information and mounting options. Jason knows his crawlers pretty good and helps people out a lot. I bought two 2000 mah batteries when I ordered my kit. The ones that I got are about 3 mm too long and just barely interfere with steering with the proline hammers mounted on stock wheels. Most people run narrow wheels so they would probably work fine for that. I'm about to order the 1290 mah lipo battery from maxamps.com as it's the perfect size. They have a 2 week wait, but when I emailed him and told him I had a comp coming up, maxamps said they will start building me a pack out of some cells that just came in and get it to me ASAP. That's the reason I only run maxamps. After every order I place, I get a hand written thank you card and some free decals. I prefer to buy from companies who act like they care about their customers.