Royal Gorilla

These plants are growing wild !! They are so bushy :D Internodes are very short, and I don't really know if I should prune subbranches or let them grow this way. For now, I tied most of them on the side so they can reach canopee as well. So, what do you suggest ? I don't plan to top them more; one time seems to be enough. Also, they don't grow tall, maybe the lamp is too close (35cm) ? It seems ok to me but I'd like your opinion on that too. I know they'll stretch when I'll put them to flo, so I'm not too worried about that. I plan to switch next week, or the next one, considering how bushy they are. Do you think it is too soon ? And finally, I spotted some little stains on a few leaves; looks like mild calcium deficiency. I plan to add some calmag to the mix soon. Again, I'm all ears to any advice you could give ! Have all a nice week friends; See you next time ! :) Edit 27/04/2020 : Late update; thanks to everyone for answering my question (about stacked internodes). Special thanks to @Budget_Buds and @OGgrows ! It was so obvious, but I haven't think about it :D So, I rised the lamp 15cm further and added red lights. I bought this lamp last year, and only started using it mid veg stage, so I wasn't prepared for this :D I'll probably prune some subbranches in the next few days too. Thanks again ! :)