T21 WJ 306 (ex Halesland) now has a spring trimmer and sealed aileron gaps. She aerotows far better than in her original form but it's still horrible! Not so much the trim as the "interesting" aileron response>
4 hours on aerotow! 'kin 'ell. They don't make 'em like that any more. 10 minutes is quite enough & then pull the yellow knob with huge relief! A really slow tug helps a lot though.
Incidentally WJ 306 also now has the "official" winch launch CofG hook. It gives 50% higher launches than the standard hook (record is 2150 feet on the wire at Weston on the Green) but then the ATC didn't really want high launches as I understand it!