I started one year ago with the hipe 5'3 when I was 95kg, in the first session I cursed the board a lot, I could not get up without trying and retrying... too much effort to enjoy
In the second session I started foiling a little bit and all was forgiven, with little time I learnt to get up in the board and now it is piece of cake for me.
Last week I made the jump to a Lethal 4'11, 80 liters, of course after one year foiling I'm now 85kg

, but again, I cursed the board the first two days due to the difficulty to get up, I'm actually still cursing, but the learning is, you need some time to adapt and if you are already a successful kiter I would risk it with the 5'3 otherwise you will get bored quick of a too big of a board.