THese are some hill sprints that Canova advocates for different types of runners. The last one, to increase strenght endurance looks a lot like your idea, so your record breaking methods are backed by current elite marathon coaches! What lenght was the race you targetted?
Agile, high frequency runner: Sprints of 60/100m with a gradient of 15% about, where they push very hard, trying long steps, for developing strenght.
(At the end of every session they go for a run of 400/500m climbing, at their max. speed (only once). This type of training has the task of using soon your strenght in direction of strenght-endurance.
100m or over of sprint, but use a hill of about 8/10 % lasting 20/25 sec. i to improve their frequency, seeking more rapidity with a good reaction in their feet, (that are not very elastic.)
Short sprints of about 40m, with a gradient of more than 30% (ramps), only for improving strenght
Runners already very strong: try to develop STRENGHT-ENDURANCE, no strenght or rapidity, already at good level.
Slim runner with long strides. Use short sprints climbing (about 15% of gradient) twice a week, going with very high knees and high frequency.
Dev. strenght-endurance: At the end of every hill sprint session go for a run of 400/500m climbing, at max. speed (only once). This type of training has the task of using soon your strenght in direction of strenght-endurance.
Recovery pace is significantly faster: around 6:40 (only 10% slower than race pace) to make the session more specific and harder (pace is at RP for most of the session and never dropping below 10% RP for the entire session). I took a snapshot of the training paces calculated for a six minute mile marathon for teh different phases. The fundamental phase has a lot of the short medium and long tempo, progression runs as well as sessions, (reps 10k pace at the very fastest, apart from uphill sprints, strides etc). The LOng run you do continues all the way to the specific phase (once every 3 weeks there).
training paces below, also a sample 3 weeks in this article
*Note there is an INtroductory phase of 8-10 weeks before the fundamental phase the elites do which includes circuits mixed with HM paces reps (400s), weights and some long runs.
Some of the sessions arent relvant to anyone slower than 2:10, id wager eg the 45-50 k run, 30k pace run etc. but knowing the progression of session paces through the phases to the race pace sessions are useful i think.
Attachment 6751