I ultimately resolved the issue. The MAF was indeed defective. I purchased a pre-owned Y-Pipe in superior condition than mine, which included one MAF. I transferred my functional MAF to it, and it accurately registered the temperature and airflow readings.
Nevertheless, I occasionally have a minor hitch after startup. During discussions with Avantgarde in Clevedon, they indicated that the adjustments must be recalibrated for optimal performance. The issue is that I currently reside in Scotland, necessitating the search for a reputable independent establishment in Edinburgh. All local garages I have contacted have provided a standard quotation of approximately £90 for one hour of service. I would be more advantageous to purchase a superior fault reader for the two minutes required to reset it.