H: Vizier (Berserk 600 Seconds)
25: 654,205,504 HP – Avg. DPS(17): 64137
10: 218,058,496 HP – Avg. DPS(6): 60571
5.9% Difference
H:Blade lord Tayak (Berserk 480 Seconds)
25: 586,604,288 HP – Avg DPS(17): 71887
10: 196,261,648 HP – Avg DPS(6): 68146
5.5% Difference
That is with under healing a 25 because 30% worth a 25 man raid of healers would be 7.5 and both of those are using 6. If we were to give 25 mans the ability to have as much healing as tens by saying they had 1 more healer.
Logs to show amount of healers per fight in 25 man:
http://worldoflogs.com/reports/rt-1yi8h7idfspdqhg5/
H: Vizier (Berserk 600 Seconds)
25: 654,205,504 HP – Avg. DPS(16): 68137
10: 218,058,496 HP – Avg. DPS(6): 60571
12.5% Difference
H:Blade lord Tayak (Berserk 480 Seconds)
25: 586,604,288 HP – Avg DPS(16): 76380
10: 196,261,648 HP – Avg DPS(6): 68146
12.1% Difference
Exactly where is a 25 man supposed to gain 5.5% DPS per person while under healing, and where is it supposed to gain 12.5% per person if they use the comparative amount of healing to tens?