If you are leaning in and sinking, bogging rail constantly, digging nose all the time... It is all because of your surfing stance. Make sure that you are not in a Poo Stance (this is the same as a standard squat stance that you will see in a weight room).. The problem with this stance is that it only allows your hips to rotate on one axis... You need to first learn to adopt "the bruce lee" stance.. Look at a professional surfer's hips... They have their feet perpendicular accross the stringer, but their upper body, abdomen, and hips are all open and loose, like you would stand if you were about to square up in a fight, like bruce lee... or like a batting stance in baseball... If you notice, the back knee is dropped, their hips can rotate on many axis' and whenever a good surfer gets low, their knees are bowing IN and NOT out (note how good surfers tuck their butts in because of this and allows them to not get clipped in the barrel)....
This requires extreme flexibility in your hips... but hey, if you want a good carving turn, and a good bottom turn, DO NOT SKIP THE FUNDAMENTALS OF YOUR SURFING STANCE! It seems so basic, yet is so vital in your ability to control your ride. on that note: SURF WITH YOUR CORE!!!!!!! don't get all stiff legged and rigid on me.
Now for the carving turn:
set up your bottom turn by compressing your body into your hips (drop your butt and get low before you do any leaning).. Point your leading shoulder toward the lip/section you are looking to hit... Pointing your shoulder will allow your hips to open up, as you begin to climb the face of the wave, ALLOW THE MOMENTUM OF THE WAVE TO CARRY YOU! As for your weight, you should have weight forward to give you momentum and speed as you project out of your bottom turn..
As you move up the face of the wave, you need to decide which kind of turn you will be doing... Your so called "ankle turns" can only do so much.. in order to do a big carving turn like the big boys, you need to understand the physics of your surfboard.. The back of the board, AKA tail of your board is the pivot point. If you want to redirect your surfboard, you need to make sure that your foot is on the sweet spot between the fins, if your back foot is too far forward, you will turn, but your board more often then not, wont.
I cannot stress it enough.. DITCH THE POO STANCE.. learn about surfing and how everything useful in surfing is counter intuitive to what your body wants to do
Open your shoulders, lead with your front arm, if you want to do a cutback, your lead arm needs to lead the way and point behind you... If you want to do a carve in a steep section, you need to open up your front arm behind you, torque your abs and hips, and allow the momentum of the wave bring the board around... Don't over do it. Don't force it.
Now dont be fooled by some misguided people who tell you turn your shoulders and then your hips.. That is simply wrong and I will tell you why... The best power surfers, carvers, rail surfers, whatever you want to call them, always set their rail first (with their ankles

and then use their shoulders to help torque their hips through.. The hips are actually moving a little bit before your shoulders... if you get good at this, you will be a carving powerhouse and throw buckets of spray. If you move your shoulders first, you lose your power... Set your rail with your ankles and hips... and then lead your shoulders through to help lean and bring your hips up into the wave.
Sorry if I went on a tangent, I love surfing and coaching surfing.. Sometimes it's easier to show then it is to type, so i tried to be as descriptive as possible without confusing people... But if I did confuse you.. My b
Mucho Aloha