OSR Explorer (Ranger): Revised Labyrinth Lord Class

I plan on running a Dolmenwood hexcrawl campaign eventually, so I've been looking over a variety of OSR systems to use as a chassis to bolt house rules onto. I've always liked Labyrinth Lord and my players tend to like AD&D, so here I am tinkering on classes.

I plan on having the players use the core human classes (cleric, fighter, magic-user, and thief) and a non-magical explorer/ranger class. I want to give them a few extra abilities, and tweak them a bit.

Explorer

Requirements: None

Prime Requisite: STR and WIS

Hit Dice: 1D8

Saving Throws: Same As LL Fighter.

Explorers have a THAC0 equal to the standard LL Cleric for melee weapons, but their THAC0 for ranged weapons is equal to the LL Fighter.

Explorers are vagabonds that travel the world, and they are accustomed to spending time in the wilderness. They wear only leather or studded leather armor (or armor made from hide or natural components). They get a damage bonus that increases at higher levels on ranged weapon damage as well as an increased chance of getting critical hits with those weapons. Rangers can use any weapons, and they can wield two weapons with both hands without penalty. They attract an animal companion at 3rd and 7th levels. At higher levels Explorers can shoot ranged weapons more times per round. They are only surprised on a 1 on 1D6.                                                                                                                                                      

XP	Lvl	HD	Abilities
0	1	8 HP	Explorer Skills, Two Weapon Combat
1,565	2	2D8	Archery +2 Dmg.
3,125	3	3D8	Animal Companion I
6,251	4	4D8	Rate of Fire: Twice per Round
12,201	5	5D8	Ranged Critical (19 & 20)
25,001	6	6D8	Archery +4 Dmg.
50,001	7	7D8	Animal Companion II
100,001	8	8D8	Archery +6 Dmg.
200,001	9	9D8	Ranged Critical (18-20)
300,001	10	10D8	Rate of Fire: Thrice per Round

                                                                                                                                                                                                                   

Explorer Skill	Lvl 1	Lvl 2	Lvl 3	Lvl 4	Lvl 5	Lvl 6	Lvl 7	Lvl 8	Lvl 9	Lvl 10
Foraging and Hunting	39	48	56	64	71	78	84	89	93	96
Hear Noise	1-2	1-2	1-2	1-3	1-3	1-3	1-4	1-4	1-4	1-5
Move Silently	41	50	58	66	73	80	86	91	95	98
Surprise Others	1-2	1-2	1-3	1-3	1-3	1-4	1-4	1-4	1-5	1-5
Survival	43	52	60	68	75	82	88	92	96	99
Tracking	45	54	62	70	77	84	90	93	97	99