Maybe it’s not your leg…
Disclaimer: this might be an unpopular opinion, but here I go.
I hear you loud and clear. I’m also a very tall rider (6’) with VERY long legs (36" inseam). All of the above suggestions are good, but I have a slightly different take on the issue.
First, make sure your saddle is big enough for you. For me, upgrading to saddle with extra long flaps and 2x forward made a HUGE difference.
And now the less popular perspective. If you are knee pinching, I’m not sure that extra two point is going to do a lot for you without your trainer there to ensure you are doing it correctly. It is indeed possible to knee pinch at the two point.
What changed my life: After 18 years of riding, I switched from hunters/eq to jumpers, and my trainer had a more European/Latin American approach. He completely changed my position. I went from riding mostly in a half seat at the canter to sitting my butt in the saddle. Every stride. God it was hard.
Before this, I seriously could ride ALL DAY LONG in the two point with a rock solid leg. But when it came to the jumps, I was always landing off balance. And it actually wasn’t my leg – it was my upper body.
So that could be the issue. With us tall people, even the slightest tilt of your body can throw you completely off balance on the other side of the jump. (Ask your trainer if you have ever thrown your body in an effort to not hit your horse in the mouth?)
And here’s the funny thing. Once I stopped riding in a half seat, my entire position changed, and I started getting all these compliments about my equitation (on the flat and over fences). My hands (and all my aids) became more independent. Everything came together. And overall, I became a softer, more effective rider. Since I had more control over my upper body at the fences, everything was great on the landing side. Within a matter of months, my trainer took me from thinking that 3’ was big to schooling 1m40 and thinking “weeeeeeeeeeeeee” that was fun!
Then things changed last year. I moved, took a lower paying job, and couldn’t afford to lease or show. I had to switch to new trainers, and finally found some who have the same philosophy as my former trainer. Sadly, now I’m only been able to ride a couple times a month. I was terrified I’d regress.
Then another amazing thing happened. My trainer went to Ocala, and arranged for me to take dressage lessons with a trainer who understands that my focus is jumpers. I love to jump. I’ll always love to jump. But this has been the BEST thing that has ever happened to me. The dressage work built on the progress I had already made. My leg is so much stronger. My seat is so much better. My aids? So much more independent. I recently popped over some fences for the first time in several months and it felt amazing. I could absolutely tell the difference.
I’ve never ridden better. And it was all my upper body, not my leg.
Oh! One more tip. See if someone can video your jumps. Watch them over and over, and play “jumping clinic” while you critique yourself. You’ll learn so much.
Note: I don’t want this to become a debate on the merits of the forward riding system. etc. That’s been done over and over and these forums. I just wanted to share my experience and give you an alternative perspective to think about.