i think that now finally understood, how much speed lose la-7 with full open oil cooler and side doors (apparently, in all tests of all la-5/7/9/11 blinds after prop were open) - because found
here, in table 7, serious error...
la-7 with full closed oil cooler=already 40 mm and full closed side doors=already 73 mm, it's correctly, how and all info about oil cooler, but in original documents just NO positions of doors, bad quality of scan (attached this page 15), only speeds - 488...487...480.5...4x7.5 (looks like 467.5) - ie apparently with full open side doors la-7 lose 20.5 kph and not how i'm assumed previously, 9 in total...
in "techical description of la-7", page 154 - "Максимальному открытию створок соответствует их ход на
80 мм от крайнего закрытого положения. В крайнем закрытом положении створки не выступают за пределы обводов наружного капота. Для выхода воздуха и выхлопных газов боковая створка поставлена с некоторым повышением над задней боковой крышкой капота таким образом, что образуется постоянная щель." - ie 73 mm (it's constant crack and doors do not create resistance, attached photo) + doors can be opened on 80 mm=153, site gives max. 136 and min. 73, don't know why 136...
on picture can also see, if i'm not mistaken, and new sides of hood for planes after start of production (quote from tests of 45210139) - "Самолет, предъявленный на испытания, отличался от самолета эталона 1944 года, проходившего государственные испытания в ГК НИИ, следующими изменениями, влияющими на аэродинамику: ...8. Укорочены боковины капота, прикрывающие
крайние выхлопные патрубки." - look at 2 last exhaust pipes, top and bottom, and for comparision attached pic with la-5 etalon 1944 (but changes can be inside and this is only my theory)...
in total, personally i think what 73mm as default it's almost similar with settings "по потоку" for old side doors, now for better cooling (with more easy managment of engine? looks like fw 190a) + because new doors and oil cooler really were much better than old, loss of speed was not so much (20.5+8.5=29 in compare with 45-50 for la-5fn)...
confirmation about oil cooler from G. Serov - "Так было показано, что расположение маслорадиатора под фюзеляжем (за 5-м шпангоутом) в специально спрофилированном туннеле снижает его лобовое сопротивление в 2 раза и обеспечивает расход воздуха через радиатор на 25-30% больший, чем при серийном варианте." - resistance of oil cooler became lower in two times and through cooler passes more air on 25-30 percent...
well, sorry for MY mistake...
...and that finally understood why in tables from Stepanets, and thus in many other sources, yak-9k and yak-9m have worst performance than early planes, well, just looks like that it's incredible mix of all planes and 518 kph at sl/6.5 min etc it's numbers from performance of yak-9t with 4 fuel tanks (not serial yak-9td or prototype of yak-9k) with around 32xx-3270 kg...
for example, about prototype of yak-9k with 4 fuel tanks - "Из-за увеличения полетной массы максимальная скорость Як-9К по сравнению с Як-9Т уменьшилась у земли - на 2...15 км/ч и на высоте 5000м - на 40...27 км/ч; время набора высоты 5000 м увеличилось до 6,5 мин (на 1,0 мин);" - ie because extra weight, in compare with yak-9t this plane was slower on 2-15 kph at sl and had +1 min to time of climb to 5000 m...
well, 533-15=518 and 5.5+1=6.5...
but 533 (average speed of t/d in 43) - 15 kph it's strange, looks like that it's various quality, error, calculation etc... 533 - around 5-7 (more weight and another aerodynamics)=524-528 ie little less than average speed of yak-9d/t/7b in 43...
about yak-9m PVO (in table with weight 3116 kg) - "Полетная масса Як-9М ПВО снизилась за счет уменьшения запаса горючего с 480 до 420 кг, масла с 45 до 30 кг, снятия брони - 16 кг и осуществления других более мелких мероприятий." - 3116 + 60 kg of fuel + 15 kg of oil + 16 kg of armor etc = at least 3207 kg of yak-9m as td version - 150 kg (in fact, 147.2) of difference between yak-9 with 2 fuel tanks and yak-9t = 3060 kg, almost normal weight of yak-9d/m with 4 fuel tanks...
etc, with yaks-3 similar situation, 570 kph at sl of normal plane and 21 sec at 1000 of bad plane, although, it's not news...