Breaststroke with replaced knees

I started swimming again about a year ago (after a 45 year layoff). For the past 6-8 months I have been doing 12-15000+ yards a week, almost all breaststroke, lots of repeats. My knees were replaced about 8 years ago and they are very good but I cannot get much drive with them. My 50 yard time is horrible for the amount of work I am doing. I believe it is because I cannot get a lot of lift when I bend them backwards (less than 90 degrees). Has anyone got any suggestions? Tom
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