It's "whether you like it or not" not "whatever you like it or not"
Really excited to see what you do with this! It's a really cool concept with excellent visual flair.
In other pbta systems, gaining 1 to a single attribute is 5 Experiences. 3 in a stat is generally considered the reasonable maximum one can go. You can also buy Moves and other benefits this way.
What you've done instead make experience into a single roll with massive benefits for success. This is a nightmare scenario.
What I might suggest instead is that training applies to specific threats or goals. PbtA is a narrative system - training should either be background justification to spending Experience or, if it's a Move, it should have a direct narrative purpose.