score:3
Your idea to practise alternate metta & breath meditation sounds ideal.
You correctly understand that the development of rapture & jhana generally require retreat conditions thus generally cannot be cultivated when there is limited time.
Upvote:1
Glad to hear you achieved certain steps in insight meditation during retreat. Your achievement will never go back if you continue mindfulness in every day living noting not detailed but grossly as when you eat , just "eat", when you walk" walk", or "move", when you touch water, "cold" or "hot", like that as simply doing as possible so that your concentration will surely help you at your short sitting meditation. All these concentration will surely lead to higher stage of insight meditation.