The trouble while trying to "fix" the XP rating is that there is no universal way of doing this. In 5E, there is no generic rule for XP progression, the encounter XP represent more or less the strength of the PC at a given level, but from this you can't infer how long they should spend in one level before going to the next. This can only be a design decision.
From what we have now, I think there are only 3 ways to award XP everyone may agree to :
- the "by the book" formula
- the "milestone" way: In this manner, don't compute XP, just award levels when it makes sense with you campaign. For myself, I adopted this long ago and it saves me a lot of unnecessary computations
- the "constant leveling", where there are always the same number of encounters between levels
All other level-up methods will lack general consensus. Some will want to have progressively more encounters to level up, but there are plenty of way of doing this, so I doubt people will reach an agreement.
Anyway, I computed for myself 2 XP charts. The first one is the constant leveling rate, set to 10 medium encounter per level. And the second is more subtle : it is a steady power increase chart, where the PC spend time to gain a level in proportion of the increase of their power.
[TABLE="class: grid, width: 500, align: center"][TR][TD]Level[/TD][TD]Total XP to reach level (official rules)[/TD][TD]Total XP to reach level (steady leveling)[/TD][TD]Total XP to reach level (steady power increase)[/TD][TD]Number of encounters corresponding to a steady power increase[/TD][/TR][TR][TD]2nd[/TD][TD]300[/TD][TD]500[/TD][TD]270[/TD][TD]5.4[/TD][/TR][TR][TD]3rd[/TD][TD]900[/TD][TD]1,500[/TD][TD]1,100[/TD][TD]8.3[/TD][/TR][TR][TD]4th[/TD][TD]2,700[/TD][TD]3,500[/TD][TD]1,800[/TD][TD]3.5[/TD][/TR][TR][TD]5th[/TD][TD]6,500[/TD][TD]6,000[/TD][TD]6,400[/TD][TD]18.4[/TD][/TR][TR][TD]6th[/TD][TD]14,000[/TD][TD]11,500[/TD][TD]10,700[/TD][TD]7.8[/TD][/TR][TR][TD]7th[/TD][TD]23,000[/TD][TD]18,000[/TD][TD]15,800[/TD][TD]7.3[/TD][/TR][TR][TD]8th[/TD][TD]34,000[/TD][TD]27,000[/TD][TD]15,800[/TD][TD]9.1[/TD][/TR][TR][TD]9th[/TD][TD]48,000[/TD][TD]37,500[/TD][TD]30,300[/TD][TD]6.5[/TD][/TR][TR][TD]10th[/TD][TD]64,000[/TD][TD]49,500[/TD][TD]40,000[/TD][TD]8.1[/TD][/TR][TR][TD]11th[/TD][TD]85,000[/TD][TD]63,500[/TD][TD]61,400[/TD][TD]15.3[/TD][/TR][TR][TD]12th[/TD][TD]100,000[/TD][TD]81,500[/TD][TD]81,500[/TD][TD]15.9[/TD][/TR][TR][TD]13th[/TD][TD]120,000[/TD][TD]104,000[/TD][TD]112,000[/TD][TD]9.8[/TD][/TR][TR][TD]14th[/TD][TD]140,000[/TD][TD]129,500[/TD][TD]137,000[/TD][TD]9.8[/TD][/TR][TR][TD]15th[/TD][TD]165,000[/TD][TD]158,000[/TD][TD]167,000[/TD][TD]10.5[/TD][/TR][TR][TD]16th[/TD][TD]195,000[/TD][TD]190,000[/TD][TD]205,000[/TD][TD]11.9[/TD][/TR][TR][TD]17th[/TD][TD]225,000[/TD][TD]226,000[/TD][TD]286,000[/TD][TD]22.5[/TD][/TR][TR][TD]18th[/TD][TD]265,000[/TD][TD]270,000[/TD][TD]327,000[/TD][TD]9.3[/TD][/TR][TR][TD]19th[/TD][TD]305,000[/TD][TD]317,500[/TD][TD]413,000[/TD][TD]18.1[/TD][/TR][TR][TD]20th[/TD][TD]355,000[/TD][TD]372,000[/TD][TD]535,000[/TD][TD]22.4[/TD][/TR][/TABLE]