I have lindy 34 n I m 155 only. It's not too bulky in my opinion but definitely heavier than 30. But the strap is really good length so that the bag is basically at your hip. I like Celine too but I would choose for lindy definitely.
Before considering whether to buy Lindy 34, it is better to go to Milxx Station and Brandoxx to try whether Lindy 34 is okay and whether Lindy 30 is better than Lindy 34. I saw some Lindys in different size in Milxx Station in Causeway Bay yesterday.
For me (height 164 cm), Lindy 30 is prefect size and hence all my Lindys (I have 3) are Lindy 30. I tried Lindy 34 before buying Lindy 30. I found that Lindy 34 was bulky and heavy.