Family with lots of electronics traveling to India connecting flight in India customs

This is my first time going to India so please cope with me. I have been doing some reading and discovered a 'potential landmine'.

From Singapore we fly to Kochi (Indian airlines) and connecting flight is in Bengaluru (SIN 21:10 -> BLR 23:15, Only one hour for connection BLR 00:15 -> COK 01:30 ), then by train that leaves 5:10 (which is usually late 1 hour) go to Goa.

Having read about customs horror stories involving electronics I need some advice... We are 5 persons (2x adults, 9-year-old, 7 years old, and baby). We have 4 laptops (2x Alienware 17), projector, iPad and 4x smartphones, (also some other stuff like oral irrigators, electric guitar, MiFi routers, etc..), everything has wear and tear marks (and has no physical receipts bought 2+ years ago on eBay, Amazon).
The way I understand our customs situation: One phone and one Alienware goes to me(price becomes irrelevant) and projector (~600 US) and this fills my allowance for 45k IRS. The second mobile and Alienware goes to my wife... (then this part I am uncertain of) can other 2x laptops + Ipad 2 + 3x phones and other stuff go to my wife as 45k IRS allowance or is it one of above (most expensive of the items), and we have to pay duty on the rest, or we can use our kids for some item allocation?

What I am worried about is that we will get stopped at COK due to the number of electronics and will miss the train to Goa.

What could I do in case this happens to prepare as much as possible (print the receipts from PayPal, make and show item allocation to persons...), or I am just being usual paranoid myself?