a541e accumulator spring/shim?

I've been working on improving the shift performance of my a541e, but I don't really want to ship my valve body to have it reworked. Does anyone know of a source for accumulator shims, or springs. I've read about shimming accumulators in tacoma trannys to get firmer shifts. I'm wanting to perform a similar upgrade. A performance sln line pressure solenoid would be cool too.