The Irorian Paladin is largely considered superior to the CoI (Champion of Irori) but I like a challenge. The archetype I linked does not qualify for CoI but its more of a replacement anyways. I'd like to see your build before I can recommend a good stat array. Rough Stats before Racial Mods for a standard Monk/Paladin would be:
Not too good.
A Scaled Fist Monk / Virtuous Bravo Paladin could go with:
Better but not great. Racial Mods will make or break these stats.
The Tortured Crusader archetype abandons its dependency on charisma. At second level you get a flat +4 to attack and AC instead of +cha. Stats could be
dex: 16 (18 with human bonus)
wis: 16 (18 with dual talent)
Dual Talent replaces your bonus feat and skilled but another +2 can go a long way. Think of the feat as Dodge but better. a 13 in strength is intentional, you qualify for power attack and don't get negative damage before you can get dex to damage.
I recently retired an Iroran Paladin from PFS play (via reaching level 12). I did a sort of postmortem review to see if there might have been a better way to build. It essentially came down to deciding on what you want to do.
With the Iroran Paladin (Strength focused), I found it had much better encounter versatility, between spell access and Personal Trial. Where it fell short was in the skills department.
In the experimental build I did as a Champion of Irori prestige class path, I managed to make it much more generally versatile using the Nornkith monk archetype and going with a Dex-based route, allowing ability focus on Dex and Cha. While it did not have a much in base hit points, it had higher saves and AC, plus ended up with solid Knowledge skill base with the help of Deific Obedience (Irori's is +4 to Knowledge skills). While it did not pack as much offensive versatility, it would be able to hold its own in fights involving evil or chaotic creatures.