[1.2.324] (3) Last chance!

Also remember that Combo Critical currently works by increasing the crit damage by 10% every 10 combos (0-10 combos = 100% crit damage, 100+ = 200% damage). As far as I'm aware nothing has changed with that, so we still have big damage there.

Combo critical
Description combo count every 10 to accumulate the probability rises to critical. \ N Required skill: # c # combo abilities over 20 levels
Max Level: 20

[Table = autonum = 1] Count Combo critical chance increased by 1% per 10, up to an increase in
Combo critical chance increased by 1% per 10-count, up to an increase in
Combo critical chance increased by 1% per 10-count, up to 2 times increase in
Combo critical chance increased by 1% per 10-count, up to 2 times increase in
Combo critical chance increased by 1% per 10-count up to three times increase in
Combo critical chance increased by 1% per 10-count up to three times increase in
Combo critical chance increased by 1% per 10-count, up to 4 times increase in
Combo critical chance increased by 1% per 10-count, up to 4 times increase in
Combo critical chance increased by 1% per 10-count, up to 5 times increase in
Combo critical chance increased by 2% per 10-count, up to 5 times increase in
Combo critical chance increased by 2% per 10-count, up to 6 times increase in
Combo critical chance increased by 2% per 10-count up to six times increase in
Combo critical chance increased by 2% per 10-count up to seven times increase in
Combo critical chance increased by 2% per 10-count up to seven times increase in
Combo critical chance increased by 2% per 10-count, up to 8 times increase in
Combo critical chance increased by 2% per 10-count, up to 8 times increase in
Combo critical chance increased by 2% per 10-count, increasing up to 9 times
Combo critical chance increased by 2% per 10-count, increasing up to 9 times
Combo critical chance increased by 2% per 10-count up to 10 times increase in
10 critical chance per combo count increased 3%, increasing up to 10 times [/ table]

- Combo Critical's crit rate increased to +4%/10 attacks.

As well as I can see, it doesn't say anything about critical damage bonuses stacking up on top of one another.