I have a pretty small frame like you so I also have to use smaller carriers. Whats worked best for me so far is the mayflower APC size small/medium with small cummerbund, TYR tactical GPC size small with small cummerbund, Ferro Concepts slickster size medium with their elastic carry cummerbund, and the First Spear STT size medium with small cummerbund. All of those fit me great.
Of those listed above the slickster is the cheapest, but its also a very barebones carrier with no molle unless you upgrade to a molle cummerbund and rear plate bag. The APC and STT both cost around the same, however the APC has a few more features and has been one of my favourite carriers for outdoor use. The TYR GPC is on the higher end price wise, however its also discontinued now so not very easy to find.
Other options that would fit a small torso well would be the LBX 0300S or a crye JPC with either small or medium plate bags
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