telling you man! i've had setups on 3 cars and it was nothing but issues for me, despite my best efforts.
clogged nozzles
leaks
issues finding exact flow rate and making it happen
nozzles not properly atomizing the meth resulting in pooling in the intake tract
controller straight FAILED by just staying on full spray during no throttle for no reason and almost siezed my engine.
also hated having a tank in the trunk, it would make the car smell like meth which is NOT a good thing to be smelling
price, mixing meth, etc it just kinda sucked for me.
dat temps though.
I see and hear all your complaints/frustrations which are common and there is scant info on how to properly install/design and dial in a water meth system. However when done right it works very well and other than checking for leaks and filling tank, pretty much problem free.
I have used meth on 4 cars since 2001 on number of cars (2001 twin turbo Audi, 2004 supercharged GTO, built MKV GTI and a supercharged 2000 Corvette. Only once I had contaminated mix container that I did not clean out before using. It was new and I should have washed it. There was either powder or residue of something and it plugged everything up. Only time I have had that happen. When using only filtered but not distilled water I found that over a long period of time I would get calcium build up. Once I switched to actual distilled water I have not had that problem.
Note about Methanol - it is highly volatile (gets into the air quickly) and has no smell and is toxic like most fuels. If I mount a tank in the shared air space of the cabin ( trunk or back of hatchback) I always vent tank to the outside. Because it has no smell you can be breathing it in and not know it.
On my MKV GTI. I ran 91 octane in tank and water meth. And with this I was able to run a 100octane tune daily for the 4 years I had the car in that config, with zero timing being pulled. That was a Snow system with 2-225ml nozzles and 50/50 mix.
The approach I take to dialing in is to look at timing being pulled (log a 4th pull). And start adding methanol at the rpms needed until all are zero. You only want just enough so you have to creep up on it using timing as your gauge. Too much and zero pull but you are quenching the ignition in the cylinder and losing power.
I have a number of tips on how to setup a system successfully, avoid all the issues mentioned which are common complaints and would be happy to help anyone interested. Just pm me