If you do not want to mis your LTT duronto,
you should get down at Dadar,
1-have nice food at Dadar where many south indian restaurant and Marathi taste is avaliable, even non veg too.
2- you buy the ticket for LLT from Dadar, > catch slow train that goes to Kurla, slow will have less rush and you can easily board train...
more... with your luggage> From Kurla, you have option of Auto to LTT or also you get antoher train to TilakNagar, dependinging upon time of your being at station/rush and your TRain Leaving Time Gap at LTT.
If you are at Panvel, the retunring trains timings too can be seen at the site link:
bit.ly/qMIfnO where all mumbai local train timings are available.
and This link :
bit.ly/8YZDRN gives you have mumbai map for locating the LLT station
Hope this will help you catch your train in time at LTT and also good lunch/dinner