4AGE Silvertop Lean and Pinging?

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Car - 1983 AE86 (SR5)

motor - 4AGE 20v Silvertop (controlled by Link G4 Storm ECU)

use - Daily Drive

problem - There is a ticking noise coming from the engine around 3000RPM - 3800RPM (usually in 3rd gear) when the car is under load. I think there is also a slight loss of power.

occurs/started when - I noticed it not long after I first got the car back from the mechanic after the engine had been installed. When I first started driving the car I always kept the revs relatively high, it was only when I started trying to drive a little more "sedately" that I noticed the noise and (I think) a slight loss of power. The noise seems to be most apparent in 3rd gear when I am accelerating and haven't stretched 2nd out, when it gets to around 4000RPM the noise disappears and the car seems to accelerate better.

personal situation - The Silvtertop engine was fully installed by a mechanic in Melbourne and tuned by AVO Turboworld in Cheltenham. When I picked the car up everything was supposed to be sorted, and it had been dyno tuned earlier that week. Comparatively (to my KE55) the car had more power, but the dyno results said it made 67.8 rwkw (which I thought was a little low, expecting around 80 - 95). My mechanic didn't mention any problems with the car or tune.

At first it all seemed fine, but (as previously mentioned) after a while I noticed a ticking noise when accelerating at around 3000RPM. I thought nothing of it and was simply going to have it looked at at the next service. I've been driving the car now for around 4 or 5 months with the performance of the car being the same as the day I picked it up. The only problem has been that the fuel pressure switch on the engine broke and needed to be replaced. The car was put on the dyno (a different one from the original run) about 2 months ago and made 67.3 rwkw (approximately the same as the original run). The tech running the dyno mentioned that the results indicated it could be running a little lean and the the air/fuel mixture could be adjusted.

I took a friend for a drive in the car last week and pointed out the ticking noise. He was slightly concerned and after a little googling he self diagnosed it as pinging. I did a little googling myself and came to the same conclusion. (Here are some of the sorts of sites that seem to fit with it ).

I had a look at some youtube videos of cars that were apparently pinging (had knock) last night and again this morning, some seem to make the same sound, others it is more of a thump. In most cases though they are getting the ticking sound even at idle.

Most things I've read state that if you are experiencing pinging you should increase the octane of the fuel you use, as a caring 86 owner I've been using 98 since I got the car (the dyno tune though was performed with the petrol that was in the tank before the engine change, which would just be regular).

Does what I'm experiencing sound like pinging? Can I still continue to drive the car until I get a chance to have it looked at by a mechanic (I'll be doing this ASAP, but it's a little difficult at the moment as I'm rather poor and use the car to get to and from work)?

In case it helps I've attached the results of the two dyno sessions and a screenshot of the fuel table from the ECU. Any advice would be appreciated. I'm not a mechanic and (while I consider myself rather smart) I have no idea when it comes to anything mechanical or electrical.