There’s something clearly wrong then,as you’re not that heavy or hammering em are ya ?.. You may need to get them re-built with new spokes etc.
I’m 25kgs heavier than you and have the same wheels on a 650 crush hardtail and some Hope enduros on a 5,& I’m
All over the place & I don’t have any problems .. Crests are a weaker rim,I’ve had them before ,but I’d be going to a specialist to seek advice ,perhaps someone on here can direct you !.
If you have another bike or can do without it for a week just post em some where !..
And another thing I’d fo is ring Hope direct there customer service is the best !..
Hope 01282 851200