Highest TWR thoughts..

Want to make a very fast rocket (acceleration wise). Obviously SRBs are the way to go. Just twiddling the sliders looks like alone, the Solid Rocket Motor achieves highest TWR at ~110% scale, with maxxed chamber pressure and nozzle throat size. For fuel, SRM takes about 2 seconds to go from 0% to 100% so stages should be more than that, but not much more to avoid an excessively low starting TWR.
'Second' serial stages should start engines before the prior stage finishes to maintain thrust.
Obviously each stage must be exponentially larger than the subsequent stage to accommodate the 'dead mass', but too wide (e.g. cone shape + LOTS of side boosters) and I find rockets are unstable and flip.
My goal is to beat 20 seconds for the 100 km challenge (I've got 22.3 seconds, with a sorta clunky design, so I feel it should be doable); was curious if anyone was tried a similar 'high score'.
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