Join the club! Above threshold is just hard. Maybe lower the intensity a bit for those. But not for your sweetspot and endurance .
I missed out general build, and went straight into MTB marathon MV. Bad decision. Now I’ve gone to general build MV and finding the vo2 sessions hard. I realise during my training and racing career I never trained so precisely , and then only with HR and perceived effort.
If you have been the same, or are new to training with power, it will take a while to adapt.
The big difference is, when using HR, and RPE you THINK you are working consistently hard for ,say 2 minutes. But you are not. The power meter doesn’t lie. 
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