OK, here's my new chunking method for counting combos and estimating ranges. The basic premise is to have chunks that are 5% and that play much the same or have roughly equivalent value. I want as few hands as possible to keep track of (so not too worried about sooted stuff - just one big chunk there). Here are the chunks:

Premium: QQ+, AQ+, KQ
pp's: 22 - JJ
Big BW: AJ, KJ, QJ, AT
Weak BW: A9, KT, QT, JT
Axs/sc's: A2s - A8s, T9s - 65s, J9s - 86s
Ax: A2o - A8o
Kxs/Qxs: K2s - K9s, Q2s - Q9s
9xK9, Q9, J9, T9, 98, T8
Connectors, 87, 76, 97, 86, J8

Since each chunk is approx. 5%, I can quickly grab the premium chunk and 3 "half chunks" when I'm trying to put someone on a 12% PFR range. I can rather quickly "guesstimate" by dropping a combo out and including some sooted crap instead, or rearrange. Also, while it's not exactly ordered top-to-bottom in terms of strength, it's reasonably close and is a pretty good approximation of the Top 45% of all NLHE hands.

This approach has gotten me to be MUCH more precise with the ranges. One key is that it forces me to put in some "bad" hands to "fill up" the whole range. When you include them all, and think about how often some predictable players cbet and/or float, you start to realize you have tons more equity than you habitually credit yourself with. Now playing that thin value is difficult and high variance, but better ranges and reads are essential to all phases of poker. And I'm getting pretty decent at it.