Game complete cr for campaign low?

Recently I made an offline account to play halo reach campaign because I am getting 1000+ game complete cr offline.

My online xbox live account seems to be only getting less than 100 game complete cr when doing normal or heroic solo or matchmaking for campaign. The bulk of my credits comes from matchmaking slot machine or playing multi-player slayer/invasion. However I prefer playing campaign and would prefer to use my online account. Is anyone else having this issue?

I’m captain rank 2, whatever rank is after warrant officer and would prefer to level that profile.

Please let me know!

I did some research and even based on this calculation which I am not sure if it even applies still…

Based on this it seems that if I do solo or co-op campaign for 30 minutes that I get a maximum of 7x10 or 70 game complete Cr. Which highly discourages people with live accounts from playing the game on their own at all.

If I played multi-player co-op apparently I would get 19.6x30 = 588 Cr for a game complete which still seems super low to me. So I guess if you plan on playing co-op or single player with friends or by yourself don’t plan on unlocking anything if you have registered that account with live.

If seems the best way to get is Firefight Doubles - Rate 4, 20min (15min for Score Attack), Firefight Limited - Rate 4, 20min, Firefight Arcade - Rate 4, 20min

Game Complete CR per minute for each rank and rate:
Rank - Rate 1, Rate 2, Rate 3, Rate 4, Rate 5
Recruit, Private, Corporal, Sergeant - 5, 14, 27, 28, 36.4
Warrant Officer - 6, 16.75, 32.4, 33.5, 43.7
Captain - 7, 19.6, 37.8, 39.2, 51
Major - 8, 22.4, 43.2, 44.8, 58.2
Lt. Colonel, Grade 1-2 - 9.2, 25.75, 49.7, 51.5, 69.2
Lt. Colonel Grade 3 - 10, 28, 54, 56, 72.8
Commander - 15, 42, 81, 84, 109.2
Commander Grade 1 - 15.5, 43.4, 83.7, 86.8, 112.8
Commander Grade 2 - 16, 44.8, 86.4, 89.6, 116.5
Commander Grade 3 - 16.5, 46.2, 89.1, 92.4, 120.1
Colonel, Colonel Grade 1 - 16.5, 46.2, 89.1, 92.4, 120.1
Colonel Grade 2 - 17, 47.6, 91.8, 95.2, 123.76
Colonel Grade 3 - 17.5, 49, 94.5, 98, 127.4
Brigadier - 20, 56, 108, 112, 145.6
Brigadier Grade 1 - 20.5, 57.4, 110.7, 114.8, 149.2
Brigadier Grade 2 - 20.9, 58.5, 112.9, 117, 152.2
Brigadier Grade 3 - 22, 61.6, 118.8, 123.2, 160.1
General - 22.5, 63, 121.5, 126, 163.8
General Grade 1-3 - 23, 64.4, 124.2, 128.8, 167.4
General Grade 4 - 23.4, 65.75, 126.8, 131.5, 171
Field Marshall - 25.8, 72.32, 139.57, 144.64, 188.16
Hero - 28.4, 79.6, 153.55, 159.2, 207
Legend - 31.2, 87.58, 168.9, 175.16, 227.7
Mythic - 34.4, 96.3, 185.8, 192.6, 250.4
Noble - 37.8, 105.97, 204.37, 211.94, 275.52
Eclipse - 41.7, 116.75, 225.16, 233.5, 303.5
Nova - 45.7, 128, 123.4, 256, 345.1
Forerunner - 50.3, 140.8, 271.6, 281.7, 366.2
Reclaimer - 55.4, 155.1, 299.2, 310.2, 403.3
Inheritor - 60.9, 170.5, 328.9, 341, 443.4

Game Type rate and maximum minutes:
Solo Campaign - Rate 1, 10min
Co-op Campaign - Rate 1, 10min
Firefight - Rate 1, 10min
Custom - Rate 1, 10min
Forge - Rate 1, 10min
Matchmaking Co-op Campaign - Rate 2, 75min
Score Attack - Rate 2, 15min
Invasion - Rate 3, 15min
Firefight Doubles - Rate 4, 20min (15min for Score Attack)
Firefight Limited - Rate 4, 20min
Firefight Arcade - Rate 4, 20min
Team Slayer - Rate 4, 12min
Squad Slayer - Rate 4, 12min
The Arena - Rate 4, 12min
Rumble Pit - Rate 4, 12min
Living Dead - Rate 4, 12min
Team Swat - Rate 4, 12min
Team Snipers - Rate 4, 12min
Double Team - Rate 4, 12min
BTB All Stars - Rate 4, 15min
Premium Slayer - Rate 5, 12min
Premium Battle - Rate 5, 12min