Struggling to increase RDL weight due to low upper body strength

Hello, I feel a bit stuck because currently I am lifting about 28kg during RDLs and want to increase it since it doesn't target my glutes as much as it did before, but at the same time it feels like my arms are about to give up towards the end of my reps.

I have really really skinny arms and even though I am working upper body I dont do it as consistently. Should I just increase the weight and maybe divide my 10 reps into 5 and 5? Any advice? I dont know if this is normal.