I'm trying to orbit Kerbin at 100km with 90º of orbit inclination using mechjeb ascend guidance but mechjeb is not making vessel orbit correctly.
The orbit is like 5º offset and the apoapsis and periapsis is not 100k, is 110k and 90k respectively (approximately)

My Vessel and Ascend Guidance settings:

Stuff inside the fairing:

Orbit:

My Addons/Mods:

KSP: 1.0.5 (Unix) - Unity: 4.6.4f1 - OS: Mac OS X 10.11.4

B9 Animation Modules - 1.0
B9 Part Switch - 1.0.1
B9 Aerospace - 6.0.1
B9 Aerospace - 6.0.1
B9 Aerospace HX Parts - 6.0.1
Chatterer - 0.9.7.86
Community Resource Pack - 0.5.1.1
Connected Living Space - 1.2.0.2
Firespitter - 7.1.5
Interstellar Fuel Switch - 1.18
RasterPropMonitor - 0.24.2
KAS - 0.5.5
KIS - 1.2.6
KSP-AVC Plugin - 1.1.5
KW-Rocketry-Community-Fixes - 0.4.10
Kerbal Joint Reinforcement - 3.1.4
Kerbal Konstructs - 0.9.5.2
Infernal Robots - 0.21.4
ORIGAMI Antennas - 0.9.5
NearFutureElectrical - 0.6.2
NearFutureSolar - 0.5.5
PlanetShine - 0.2.4.2
Kerbal Planetary Base Systems - 1.0.6
RCS Build Aid - 0.7.7
RemoteTech - 1.6.9
SCANsat - 1.1.4.9
TAC Fuel Balancer - 2.5.1.7
TextureReplacer - 2.4.12
TAC Life Support - 0.11.2.1
Kerbal Alarm Clock - 3.5
TweakScale - 2.2.6