No never seen this from my experience, slippage is always a cost over large sample size, even in NIfty, even with 1 lot. It does not even out in indian makets.
So yeah better to have some space in calculations. Would be less of an issue for HTF and only positive slippage if you can manage to enter using limit orders.
So yeah better to have some space in calculations. Would be less of an issue for HTF and only positive slippage if you can manage to enter using limit orders.