True, esp with a leveraged portfolio open positions can fluctuate a lot. On the flip side, your strategy is low-frequency, so over time they can fluctuate a lot. To mitigate this you need to rebalance your portfolio indeed, esp in volatile markets. It will a tradeoff between rebalancing your portfolio/risk and limiting your costs.
Maybe a spreadsheet with past trades, powered by a solver could help to find an optimal rebalance frequency?
