I ski Reflex with a RTP, toes are under the heel block almost touching front boot and it works great for me. Two weeks ago I had forgotten to take my boot and had to ski on my spare which is a newer model with the block upside down , It was blocking my toes to seat as close as usually do and the result was a more radical onside (it was like I had changed ski settings).
In your case you have the shell and the liner between your toes and front shell, I would cut the tip of the shell in order for the liner to sit closer to the front heel, I believe it worth the try and the risk of throwing away a good boot.
If over tightening the buckles is also an issue, I solved that by taking off the buckles like in the picture below, result is also a cleaner longer lasting boot.
Good luck,
Alex,