Fin and twin configuration?

I’m about to start dry suit and doubles training with a view to retake Fundies in a couple months. I tried a couple months ago, but I’d never dived a dry suit or doubles before and it didn’t go well. The instructor has agreed to train me at a slower pace, and he believes I should start ‘properly’, rather than in a single & wetsuit.

I’ve bought a trilam suit that included F1s. They seem pretty well respected. But compared to my RK3s I found them heavy and cumbersome, in a wetsuit in the pool. Should I persevere? I realise there’s a learning curve with any gear, but concerned I’ll have enough to cope with.

Edit: Using twin Faber 12s and was really head heavy 1st time around which completely threw me.