I have just a couple of comments. I was playing around with starting stats on a 32 point halfling and I'd recommend the following:
S 16
D 16
C 14
I 8
W 8
Ch 12
If you ate a +1 Dex tome you'd have the GTWF dex requirement which would leave you able to put level up points into strength. Be aware that with a 12 Charisma to start, you'll probably end up with around 700 SP at end game for buffing (at a minimum) which is plenty for a Warchanter.
I find the trickiest part of playing a Warchanter is HP and BAB. If you can fit a Toughness feat in there you should. It's tough to get to 400 HP with a starting 14 Con and requires gear and dedicated focus to reach a respectable amount of HP for end game. While Displacement is a huge help to overcome the lack of AC and HP, many of the bosses at end game have true seeing and you will find you get whacked alot more than a tank type with comparable HP. So, to me, a starting 14 Con is a minimum and a must.
Second is the BAB issue. Divine Power clickies can help but don't last long so the Madstone boots are the easiest way to get fighter BAB, the trick is to time it with the short term buffs so that you aren't waiting around for the Madstone to wear off before you can displace and haste yourself again. Trust me, this can get irritating, lol.
Anyway, for now, those are the biggest pieces of advice I can offer. Hope this helps!