I don't think you are restricted by Cabin Bag weight,just size.
From Easy Jet website
Our cabin bag guarantee means you can make sure your bag travels with you in the cabin, even on the busiest flights.
To take advantage of the guarantee, simply bring ONE slightly smaller bag no bigger than 50 x 40 x 20cm including handles and wheels and we’ll guarantee it will travel with you either in the overhead locker or, if necessary, under the seat in front of you.
You can still choose to bring ONE slightly bigger bag up to the maximum size of 56 x 45 x 25cm including handles and wheels, but on some busy flights your bag may have to go into the hold.
easyJet plus cardholders, FLEXI fare, easyJet plus Upfront or Extra Legroom customers, can continue to bring ONE piece of cabin baggage no bigger than 56 x 45 x 25cm including handles and wheels – and use easyJet plus Speedy Boarding to board first in order to secure space in the overhead lockers.
So if keeping your cabin bag with you is a priority, why not bring a slightly smaller bag (which is still big enough to hold all your travel essentials) and we guarantee it will not go in the hold – even if the flight is full.