Polymarket and position sizing - how do you guys approach it?

Been dabbling more with Polymarket lately, mostly on political outcomes or big $BTC moves. I get the idea of betting smaller on highly uncertain longshots and bigger on strong convictions, but finding that sweet spot is proving tougher than anticipated. Are you all just using a fixed percentage of your allocated 'play money' per market, or is there a more nuanced approach you'd recommend for sizing positions based on perceived edge and market liquidity? Feel like I'm leaving money on the table sometimes, or overextending when I shouldn't.