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From everything I've read about Ansmann you're better off steering well clear. It's definately a downgrade from an ST pro.

Looks pretty nice and should be very light. I'm not convinced by the battery pack located under the fuel tank but as long as the connector is easy to get to it shouldn't be a problem. I've never had to actually take a battery out of any of my cars.

Could have been too lean. To be fair though my old hyper engine ate glow plugs too, just continue with tuning and see how it goes. Also remember to get the engine upto temperature before you start tuning and do it gradually. Once you've done an adjustment, run it for 30 seconds or so. All of the hyper engines I've seen have been notoriously difficult to tune. One minute they can be fine and the next it's running lean. I'd be a bit concerned about the coil jamming in the P&L in case there's any damage to the internals, if it starts cutting out randomly I'd say it's time for a new engine.

I think that is the recommended plug for the engine. Did you use the copper shim that it came with?

Lean or rich, no glow plug should lose it's coil! Could be a few things, too lean, forgot to use shim, wrong glow plug type........ Start by leaning it off at least half a turn then fine tune from there. If it's still blowing glow plugs use the engine manufacturers recommended glow plug or see your LHS. What engine is it btw?

Are you confusing pinch with compression? If you replaced the piston/sleeve every time an engine lost it's pinch you'd be pretty broke. All engines will lose pinch which is no bad thing, pinch is what gets less and less as the engine is run in as the piston and liner bed in. A loss of pinch puts less stress on the engine and it runs cooler. Now if it loses compression that's a different matter. If an engine loses compression after 20 litres I'd be sending the engine back to the manufacturer or learning how to tune an engine properly

I'm fairly certain that the shock towers don't fit

That bag is fine but you'll only get one car in there mate. Not seen any hauler that can accommodate 2 cars. Only option I can think of is that hauler plus a dedicated car bag.

If you have 2.4ghz then the system usually has a failsafe built in and installing a 3rd party one won't actually work. I had this issue with a couple of hyper 7's I bought. The failsafes I'd installed wouldn't override the one built into the rx. Take the ones you've installed out and stick with the built-in ones. Also have to agree with setting full brake as a failsafe position. It's not going to do your servo any good at all. Setting it to neutral position is absolutely fine.

Once you start leaning off the high speed needle the clutch will engage sooner and acceleration will be much better. Unfortunately when initially running an engine in you have to give it lots of revs to get it going and for someone new to this, it can seem as if the engine or clutch is faulty as there's a severe lack of performance and it sounds bloody horrible! Don't worry though, stick at it, put a few tanks through it then start leaning it off.

All depends on what someone is prepared to pay but I highly doubt you'll get much more than

New engine running rich will need a lot of revs to engage the clutch, it's quite common. Don't worry about having to do it as it will have so much fuel running through it, the engine will be well lubricated and cool. You'll have to do this every time from a standing start but once it's actually moving it shouldn't take much throttle to keep it moving.

The ST Pro is a beast. It weighs quite a lot for a pro truggy but it's tough and very reliable. You have the pro version so you shouldn't need to upgrade anything on it at all.

The hyper 21 engines aren't much better tbh. Always chasing a tune and mine lost compression after 2 gallon! If it were me, I'd buy a cheap roller (the basic car is fairly robust with a couple of upgrades) and use the remaining money to buy a reliable engine and servos. CNC shock towers are a must if you're bashing hard.

Also helps to put a couple of drops down the carb if it's gonna be stood for a while.