You realize that RAmar can't equip Silence Claw, right?

Unforunately, there's a severe lack of decent ranger melee weapons for Purplenum... I'd advise getting at least one other character into Ultimate (perhaps your Yellowboze, as they find a wider variety of the common weapons and also Red Saber in the forest).
I've never heard of the "piping through doors trick," but there are 2 slimes (possible 8 slimes) in Addicting Food, 2 rooms after the waterfall room. Leave your pipe behind the door... run in, rabarta every time one pops up (you don't want to have them attack each other), run away fast, use the healing ring in the east room when you run out of TP.
When you get to ruins, hunt yourself a Spread Needle from Merlans... those rule.

A decent (yet not TOO rare) ranger arsenal includes the FS which you have, a Spread Needle (or perhaps a high-hit shot with a good special), and a mechgun such as Red Mechs (also available to you in Ruins). Red Handgun is a good power gun, too, although I'd give preference toward something RA-only for uniqueness.
In your sig you mention a gungnir... it's not a bad idea to carry something like this, especially if it has hit%. As a soloing ranger you won't have much success with a shot for long (especially if you have no God or Devil/Battle), so unless you have a Spread (or srank) Needle you may want to switch to your partisan. Keep s/d on at all times and keep hitting them with the partisan... that's what got my RAmar through VH Ruins, IIRC (the first time, anyway).
For comparison, my RAmar uses:
Yasminkov 3000R +60 10/0/25/0/0 (I didn't tek it so don't blame me for the 10%. trying to replace this with a good srank rifle)
Frozen Shooter +9 0/15/0/0/35 (my most cherished 10-star piping rare

)
God Hand +30 10/0/0/0/0 (got from SoaB so couldn't tek up)
Spread Needle +40 15/0/0/0/0
Yasminkov 9000M +10 0/0/0/0/35
Twin Blaze 0/0/0/0/0 (haven't grinded this one yet)
Red Scorpio +25 0/0/0/0/0 (used to be 50 but it got FSODed and my backup-dupe only had 25... so I owe myself 25 grinders

)
Brightness Circle, God/Power, God/Luck, Hero/Ability, God/Battle
Secure Feet
Pushan 20/120/46/24 (I think... funny, I can't remember right now, brainfreeze

)