u/Hobbit54321

I will try to keep this concise. I picked up an 09 Bonnie base model about two weeks ago. Besides the test ride today is the first time I have had a chance to ride it. It has about 2600 miles on it. No I didn't forget a zero on the mileage. The only things I have done to the bike are new tires as the old ones were 18 years old. I also changed the oil and filter on it. I used a WIX filter and Rotella T5. The bike will accelerate fine up to about 70mph. After that if I try to give it more throttle it actually starts slowing down. If I gingerly play with the throttle it will get up to about 75. I realize I am not riding a sport bike and I weigh 270 dressed to ride. Am I asking the bike for more than it can give? Or, do I genuinely need to look at mechanical/electrical issues? As a side note I did throw about 1.5 oz of seafoam in a full tank thinking maybe partially clogged injectors. It only has about 30 miles on that gas. I appreciate any advice y'all have for me.