I have no used these skates 6 times and I have adjusted to the boot in terms of comfort but I just can't not adjust to the blades, I know these are a 3mm and my old skates were a 4mm. DonI have an option to switch back to a 4mm with these holders? Also I do not know much about profiling but the main issue that I am having is I feel that the toe of the blade is massive and it is hindering my skating, how I get up and my movement in the crease. What profile would help me most?